$AMT
AMERICAN TOWER CORP /MA/ Stock $amt

$amt Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000105350720000028 Filed on February 25, 2020

Income Statement

Concept	2019 Q4	2019	2018 Q4
Revenue	$1.924B	$7.580B	$2.132B
YoY Change	-9.77%	1.88%	25.07%
Cost Of Revenue	$550.2M	$43.10M	$540.9M
YoY Change	1.72%	-12.22%	2.64%
Gross Profit	$1.374B	$7.537B	$1.591B
YoY Change	-13.67%	1.98%	35.12%
Gross Profit Margin	71.4%	99.43%	74.63%
Selling, General & Admin	$179.6M	$730.4M	$192.5M
YoY Change	-6.7%	-0.38%	12.51%
% of Gross Profit	13.08%	9.69%	12.1%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$449.8M	$905.5M	$765.9M
YoY Change	-41.27%	2.54%	64.32%
% of Gross Profit	32.75%	12.01%	48.14%
Operating Expenses	$549.7M	$730.4M	$1.200B
YoY Change	-54.18%	-0.38%	80.24%
Operating Profit	$661.3M	$2.688B	$388.9M
YoY Change	70.04%	41.12%	18.21%
Interest Expense	-$198.0M	$814.2M	-$195.7M
YoY Change	1.18%	-1.37%	7.23%
% of Operating Profit	-29.94%	30.29%	-50.32%
Other Income/Expense, Net	$5.600M	-$772.0M	$7.400M
YoY Change	-24.32%	2.88%	-254.17%
Pretax Income	$468.9M	$1.916B	$197.3M
YoY Change	137.66%	58.03%	39.53%
Income Tax	-$100.5M	-$200.0K	-$95.40M
% Of Pretax Income	-21.43%	-0.01%	-48.35%
Net Earnings	$562.7M	$1.888B	$277.6M
YoY Change	102.7%	52.69%	16.39%
Net Earnings / Revenue	29.25%	24.9%	13.02%
Basic Earnings Per Share	$1.27	$4.27	$0.63
Diluted Earnings Per Share	$1.26	$4.24	$0.62
COMMON SHARES
Basic Shares Outstanding	442.9M shares	442.3M shares	440.5M shares
Diluted Shares Outstanding		445.5M shares

Balance Sheet

Concept	2019 Q4	2019	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.501B	$1.501B	$1.209B
YoY Change	24.15%	24.15%	50.56%
Cash & Equivalents	$1.501B	$1.501B	$1.209B
Short-Term Investments			$0.00
Other Short-Term Assets	$377.0M	$377.0M	$505.0M
YoY Change	-25.35%	-25.35%	-8.18%
Inventory
Prepaid Expenses	$56.80M		$40.50M
Receivables	$462.2M	$462.0M	$459.0M
Other Receivables	$214.0M	$214.0M	$212.0M
Total Short-Term Assets	$2.554B	$2.554B	$2.385B
YoY Change	7.07%	7.09%	17.03%
LONG-TERM ASSETS
Property, Plant & Equipment	$19.44B	$19.44B	$11.25B
YoY Change	72.86%	72.86%	1.32%
Goodwill	$6.178B		$5.502B
YoY Change	12.29%		-2.42%
Intangibles	$12.32B		$11.17B
YoY Change	10.24%		-5.17%
Long-Term Investments
YoY Change
Other Assets	$406.4M	$1.903B	$962.6M
YoY Change	-57.78%	9.43%	1.32%
Total Long-Term Assets	$40.25B	$40.25B	$30.63B
YoY Change	31.42%	31.42%	-1.77%
TOTAL ASSETS
Total Short-Term Assets	$2.554B	$2.554B	$2.385B
Total Long-Term Assets	$40.25B	$40.25B	$30.63B
Total Assets	$42.80B	$42.80B	$33.01B
YoY Change	29.66%	29.66%	-0.61%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$148.1M	$148.0M	$130.8M
YoY Change	13.23%	12.98%	-8.47%
Accrued Expenses	$958.2M	$1.529B	$948.3M
YoY Change	1.04%	57.47%	11.0%
Deferred Revenue	$294.3M		$304.1M
YoY Change	-3.22%		13.13%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$2.928B	$2.928B	$2.755B
YoY Change	6.29%	6.28%	255.55%
Total Short-Term Liabilities	$5.488B	$5.488B	$4.690B
YoY Change	17.01%	17.01%	86.69%
LONG-TERM LIABILITIES
Long-Term Debt	$21.13B	$21.13B	$18.41B
YoY Change	14.79%	14.79%	-5.28%
Other Long-Term Liabilities	$937.0M	$8.832B	$1.265B
YoY Change	-25.93%	256.85%	1.68%
Total Long-Term Liabilities	$937.0M	$29.96B	$19.67B
YoY Change	-95.24%	43.48%	-4.86%
TOTAL LIABILITIES
Total Short-Term Liabilities	$5.488B	$5.488B	$4.690B
Total Long-Term Liabilities	$937.0M	$29.96B	$19.67B
Total Liabilities	$36.21B	$37.75B	$26.11B
YoY Change	38.72%	36.4%	3.35%
SHAREHOLDERS EQUITY
Retained Earnings	-$1.017B		-$1.200B
YoY Change	-15.23%		13.36%
Common Stock	$4.500M		$4.500M
YoY Change	0.0%		2.27%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$1.226B		$1.207B
YoY Change	1.62%		23.9%
Treasury Stock Shares	10.65M shares		10.56M shares
Shareholders Equity	$5.055B	$5.055B	$5.336B
YoY Change
Total Liabilities & Shareholders Equity	$42.80B	$42.80B	$33.01B
YoY Change	29.66%	29.66%	-0.61%

Cashflow Statement

Concept	2019 Q4	2019	2018 Q4
OPERATING ACTIVITIES
Net Income	$562.7M	$1.888B	$277.6M
YoY Change	102.7%	52.69%	16.39%
Depreciation, Depletion And Amortization	$449.8M	$905.5M	$765.9M
YoY Change	-41.27%	2.54%	64.32%
Cash From Operating Activities	$993.7M	$3.753B	$1.263B
YoY Change	-21.33%	0.11%	60.1%
INVESTING ACTIVITIES
Capital Expenditures	-$266.7M	$991.3M	-$302.8M
YoY Change	-11.92%	8.55%	21.8%
Acquisitions		$2.960B
YoY Change		57.31%
Other Investing Activities	-$2.320B	$64.20M	-$391.6M
YoY Change	492.44%	21.59%	-62.41%
Cash From Investing Activities	-$2.587B	-$3.988B	-$694.4M
YoY Change	272.51%	45.03%	-46.19%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$19.60M
YoY Change		-91.58%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	1.696B	$521.7M	-573.4M
YoY Change	-395.83%	-185.85%	-214.47%
NET CHANGE
Cash From Operating Activities	993.7M	$3.753B	1.263B
Cash From Investing Activities	-2.587B	-$3.988B	-694.4M
Cash From Financing Activities	1.696B	$521.7M	-573.4M
Net Change In Cash	103.3M	$273.1M	-4.600M
YoY Change	-2345.65%	-21.97%	820.0%
FREE CASH FLOW
Cash From Operating Activities	$993.7M	$3.753B	$1.263B
Capital Expenditures	-$266.7M	$991.3M	-$302.8M
Free Cash Flow	$1.260B	$2.761B	$1.566B
YoY Change	-19.51%	-2.6%	50.93%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019Q4	amt	Preferred Stock Depositary Shares Percentageof Preferred Shares PreferredStockDepositarySharesPercentageofPreferredShares	0.1	shares
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001053507
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	451617000	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	453541000	shares
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	441060000	shares
CY2018	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.05
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	26400000	USD
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	442890000	shares
CY2017	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	1
CY2018	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	1
CY2017	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.05
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-4500000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	6100000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	1000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-2600000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	500000	USD
CY2017	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	20700000	USD
CY2018	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	25000000	USD
CY2019	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	11200000	USD
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	10557000	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	10651000	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	001-14195
CY2019	dei	Entity Registrant Name EntityRegistrantName	American Tower Corporation
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	65-0723837
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	116 Huntington Avenue
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Boston
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	MA
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	02116
CY2019	dei	City Area Code CityAreaCode	617
CY2019	dei	Local Phone Number LocalPhoneNumber	375-7500
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q2	dei	Entity Public Float EntityPublicFloat	89900000000	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	442911804	shares
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1501200000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1208700000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	76800000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	96200000	USD
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CY2019Q4	us-gaap	Assets Current AssetsCurrent	2553800000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	2385100000	USD
CY2019Q4	amt	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	12084400000	USD
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CY2019Q4	us-gaap	Goodwill Goodwill	6178300000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	5501900000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	12318400000	USD
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CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	131800000	USD
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CY2019Q4	us-gaap	Deferred Rent Receivables Net Noncurrent DeferredRentReceivablesNetNoncurrent	1771100000	USD
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CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	7357400000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	406400000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	962600000	USD
CY2019Q4	us-gaap	Assets Assets	42801600000	USD
CY2018Q4	us-gaap	Assets Assets	33010400000	USD
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CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	958200000	USD
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CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	209400000	USD
CY2018Q4	us-gaap	Interest Payable Current InterestPayableCurrent	174500000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	494500000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	2928200000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	2754800000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	294300000	USD
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CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	4689900000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-1016800000	USD
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CY2019Q4	us-gaap	Liabilities Liabilities	36214700000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	26106000000.0	USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
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CY2019Q4	us-gaap	Common Stock Value CommonStockValue	4500000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	4500000	USD
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CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2823600000	USD
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CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	1226400000	USD
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CY2019Q4	us-gaap	Minority Interest MinorityInterest	435000000.0	USD
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CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	42801600000	USD
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CY2019	us-gaap	Revenues Revenues	7580300000	USD
CY2018	us-gaap	Revenues Revenues	7440100000	USD
CY2017	us-gaap	Revenues Revenues	6663900000	USD
CY2019	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	2173700000	USD
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CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	43100000	USD
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CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	34600000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1778400000	USD
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CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	730400000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	733200000	USD
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CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	166300000	USD
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CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	256000000.0	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	4891900000	USD
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CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	2688400000	USD
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CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	0	USD
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CY2017	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	10800000	USD
CY2019	us-gaap	Interest Income Other InterestIncomeOther	46800000	USD
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CY2017	us-gaap	Interest Income Other InterestIncomeOther	35400000	USD
CY2019	us-gaap	Interest Expense InterestExpense	814200000	USD
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CY2017	us-gaap	Interest Expense InterestExpense	749600000	USD
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CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-70200000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	17600000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	23800000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	31300000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-772000000.0	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-750400000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-742300000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1916400000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1154600000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1256100000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-200000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-110100000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30700000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1916600000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1264700000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1225400000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	28800000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	28300000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-13500000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1887800000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1236400000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	1238900000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	9400000	USD
CY2017	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	87400000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1887800000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1227000000.0	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1151500000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.27
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.79
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.69
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.24
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.77
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.67
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	442319000	shares
CY2017	us-gaap	Profit Loss ProfitLoss	1225400000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	439606000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	428181000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	445520000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	442960000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	431688000	shares
CY2019	us-gaap	Profit Loss ProfitLoss	1916600000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1264700000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-100000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-100000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-200000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-300000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	100000	USD
CY2019	amt	Other Comprehensive Income Loss Redeemable Noncontrolling Interest Adjustment Net Of Tax OtherComprehensiveIncomeLossRedeemableNoncontrollingInterestAdjustmentNetOfTax	0	USD
CY2018	amt	Other Comprehensive Income Loss Redeemable Noncontrolling Interest Adjustment Net Of Tax OtherComprehensiveIncomeLossRedeemableNoncontrollingInterestAdjustmentNetOfTax	78800000	USD
CY2017	amt	Other Comprehensive Income Loss Redeemable Noncontrolling Interest Adjustment Net Of Tax OtherComprehensiveIncomeLossRedeemableNoncontrollingInterestAdjustmentNetOfTax	0	USD
CY2019	amt	Other Comprehensive Income Loss Purchase Of Noncontrolling Interest Net Of Tax OtherComprehensiveIncomeLossPurchaseOfNoncontrollingInterestNetOfTax	0	USD
CY2018	amt	Other Comprehensive Income Loss Purchase Of Noncontrolling Interest Net Of Tax OtherComprehensiveIncomeLossPurchaseOfNoncontrollingInterestNetOfTax	500000	USD
CY2017	amt	Other Comprehensive Income Loss Purchase Of Noncontrolling Interest Net Of Tax OtherComprehensiveIncomeLossPurchaseOfNoncontrollingInterestNetOfTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-157900000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-869300000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	144400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-157800000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-789800000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	143900000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1758800000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	474900000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1369300000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-3800000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-96900000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	109400000	USD
CY2019	amt	Comprehensive Income Loss Net Of Tax Attributable To Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest	55500000	USD
CY2018	amt	Comprehensive Income Loss Net Of Tax Attributable To Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest	0	USD
CY2017	amt	Comprehensive Income Loss Net Of Tax Attributable To Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest	0	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1707100000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	571800000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1259900000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6976200000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	195000000.0	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	9000000.0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	100000	USD
CY2017	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities Net Of Adjustments StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments	0.0	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	766300000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-400000	USD
CY2017	amt	Other Comprehensive Income Loss Foreign Currency Transactionand Translation Adjustment Netof Tax Less Amount Reclassifiedto Additional Paidin Capital OtherComprehensiveIncomeLossForeignCurrencyTransactionandTranslationAdjustmentNetofTaxLessAmountReclassifiedtoAdditionalPaidinCapital	76100000	USD
CY2017	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	314100000	USD
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	14300000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1128600000	USD
CY2017	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	91400000	USD
CY2017	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	1258800000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6828100000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	190400000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	10200000	USD
CY2018	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities Net Of Adjustments StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments	0.0	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	232800000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-100000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-300000	USD
CY2018	amt	Other Comprehensive Income Loss Foreign Currency Transactionand Translation Adjustment Netof Tax Less Amount Reclassifiedto Additional Paidin Capital OtherComprehensiveIncomeLossForeignCurrencyTransactionandTranslationAdjustmentNetofTaxLessAmountReclassifiedtoAdditionalPaidinCapital	-777200000	USD
CY2018	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	28100000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	15000000.0	USD
CY2018	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	20500000	USD
CY2018Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	38400000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1397300000	USD
CY2018	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	18900000	USD
CY2018	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	1265900000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5899600000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	143200000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	11300000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	19600000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-200000	USD
CY2019	amt	Other Comprehensive Income Loss Foreign Currency Transactionand Translation Adjustment Netof Tax Less Amount Reclassifiedto Additional Paidin Capital OtherComprehensiveIncomeLossForeignCurrencyTransactionandTranslationAdjustmentNetofTaxLessAmountReclassifiedtoAdditionalPaidinCapital	-149600000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	14600000	USD
CY2019	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	68500000	USD
CY2019	amt	Noncontrolling Interest Decrease From Reclassification From Permanent To Temporary Equity NoncontrollingInterestDecreaseFromReclassificationFromPermanentToTemporaryEquity	523000000.0	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Increase In Carrying Amount Of Redeemable Preferred Stock AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	0.0	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1680400000	USD
CY2019Q1	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	-24700000	USD
CY2019	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	1916600000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5490400000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1916600000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1264700000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1225400000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1778400000	USD
CY2018	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	2110800000	USD
CY2017	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1715900000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	111400000	USD
CY2018	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	479600000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	137500000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	108500000	USD
CY2019	amt	Loss Gain On Investments And Other Non Cash Income Expense LossGainOnInvestmentsAndOtherNonCashIncomeExpense	46200000	USD
CY2018	amt	Loss Gain On Investments And Other Non Cash Income Expense LossGainOnInvestmentsAndOtherNonCashIncomeExpense	47300000	USD
CY2017	amt	Loss Gain On Investments And Other Non Cash Income Expense LossGainOnInvestmentsAndOtherNonCashIncomeExpense	-18000000.0	USD
CY2019	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	140000000.0	USD
CY2017	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	242400000	USD
CY2019	us-gaap	Extinguishment Of Debt Gain Loss Net Of Tax ExtinguishmentOfDebtGainLossNetOfTax	-22200000	USD
CY2018	us-gaap	Extinguishment Of Debt Gain Loss Net Of Tax ExtinguishmentOfDebtGainLossNetOfTax	-3300000	USD
CY2017	us-gaap	Extinguishment Of Debt Gain Loss Net Of Tax ExtinguishmentOfDebtGainLossNetOfTax	-70200000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	25900000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	22100000	USD
CY2017	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	20000000.0	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-55100000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-303000000.0	USD
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-86600000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-12500000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	32100000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	191100000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	67600000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	101700000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	179900000	USD
CY2019	us-gaap	Straight Line Rent StraightLineRent	183500000	USD
CY2018	us-gaap	Straight Line Rent StraightLineRent	87600000	USD
CY2017	us-gaap	Straight Line Rent StraightLineRent	194400000	USD
CY2019	amt	Increase Decrease In Right Of Use Asset And Operating Lease Liability IncreaseDecreaseInRightOfUseAssetAndOperatingLeaseLiability	-17400000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-46800000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	69300000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	95800000	USD
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	32400000	USD
CY2018	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	8400000	USD
CY2017	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	9200000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	2500000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	85800000	USD
CY2017	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	59300000	USD
CY2019	amt	Increase Decrease In Deferred Rent Liability IncreaseDecreaseInDeferredRentLiability	0	USD
CY2018	amt	Increase Decrease In Deferred Rent Liability IncreaseDecreaseInDeferredRentLiability	-57900000	USD
CY2017	amt	Increase Decrease In Deferred Rent Liability IncreaseDecreaseInDeferredRentLiability	-62300000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	100000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-14000000.0	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-13400000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3752600000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3748300000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2925600000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	991300000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	913200000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	803600000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2959600000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1881400000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2007000000.0	USD
CY2019	amt	Proceeds From Sale Of Available For Sale Securities And Other Productive Assets ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets	383500000	USD
CY2018	amt	Proceeds From Sale Of Available For Sale Securities And Other Productive Assets ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets	1252200000	USD
CY2017	amt	Proceeds From Sale Of Available For Sale Securities And Other Productive Assets ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets	14700000	USD
CY2019	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	355900000	USD
CY2018	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	1154300000	USD
CY2017	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	0	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	64200000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	52800000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	5000000.0	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3987500000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2749500000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2800900000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	5750000000.0	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	3263300000	USD
CY2017	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	5359400000	USD
CY2019	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	4876700000	USD
CY2018	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	584900000	USD
CY2017	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	2674000000.0	USD
CY2019	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1300000000.0	USD
CY2018	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1500000000.0	USD
CY2017	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	500000000.0	USD
CY2017	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2019	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	9225300000	USD
CY2018	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	4884800000	USD
CY2017	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	6484400000	USD
CY2019	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	11800000	USD
CY2018	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	14400000	USD
CY2017	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	264300000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	19600000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	232800000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	766300000	USD
CY2019	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	105500000	USD
CY2018	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	98900000	USD
CY2017	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	119700000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1603000000.0	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1323500000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1073000000.0	USD
CY2019	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2018	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	18900000	USD
CY2017	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	91400000	USD
CY2019	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	21000000.0	USD
CY2018	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	3300000	USD
CY2017	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	75300000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-135600000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-56600000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-40000000.0	USD
CY2019	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	425700000	USD
CY2018	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	0	USD
CY2017	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	0	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	68500000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	20500000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	521700000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-607700000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-113000000.0	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-13700000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-41100000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6700000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	273100000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	350000000.0	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	18400000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1304900000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	954900000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	936500000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1578000000.0	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1304900000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	954900000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	45900000	USD
CY2019	amt	Equity Method Investments Number Of Joint Ventures With Controlling Interests EquityMethodInvestmentsNumberOfJointVenturesWithControllingInterests	2	joint_venture
CY2019	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	68500000	USD
CY2019	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	523000000.0	INR
CY2019Q4	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	6	segment
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-bottom:10px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Significant Accounting Policies and Use of Estimates</span><span style="font-family:inherit;font-size:10pt;">—The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results may differ from those estimates, and such differences could be material to the accompanying consolidated financial statements. The significant estimates in the accompanying consolidated financial statements include impairment of long-lived assets (including goodwill), asset retirement obligations, revenue recognition, rent expense and lease accounting, income taxes and accounting for business combinations and acquisitions of assets. The Company considers events or transactions that occur after the balance sheet date but before the financial statements are issued as additional evidence for certain estimates or to identify matters that require additional disclosure.</span></div>
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="line-height:120%;padding-bottom:10px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Accounts Receivable and Deferred Rent Asset</span><span style="font-family:inherit;font-size:10pt;">—The Company derives the largest portion of its revenues and corresponding accounts receivable and the related deferred rent asset from a relatively small number of tenants in the telecommunications industry, and </span><span style="font-family:inherit;font-size:10pt;"><span>54%</span></span><span style="font-family:inherit;font-size:10pt;"> of its current-year revenues are derived from </span><span style="font-family:inherit;font-size:10pt;">four</span><span style="font-family:inherit;font-size:10pt;"> tenants. </span></div><div style="line-height:120%;padding-bottom:8px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company’s deferred rent asset is associated with non-cancellable tenant leases that contain fixed escalation clauses over the terms of the applicable lease in which revenue is recognized on a straight-line basis over the lease term.</span></div><div style="line-height:120%;padding-bottom:8px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company mitigates its concentrations of credit risk with respect to notes and trade receivables and the related deferred rent assets by actively monitoring the creditworthiness of its borrowers and tenants. In recognizing tenant revenue, the Company assesses the collectibility of both the amounts billed and the portion recognized in advance of billing on a straight-line basis. This assessment takes tenant credit risk and business and industry conditions into consideration to ultimately determine the collectibility of the amounts billed. To the extent the amounts, based on management’s estimates, may not be collectible, revenue recognition is deferred until such point as collectibility is determined to be reasonably assured. Any amounts that were previously recognized as revenue and subsequently determined to be uncollectible are charged to bad debt expense included in Selling, general, administrative and development expense in the accompanying consolidated statements of operations.</span></div>Accounts receivable is reported net of allowances for doubtful accounts related to estimated losses resulting from a tenant’s inability to make required payments and allowances for amounts invoiced whose collectibility is not reasonably assured. These allowances are generally estimated based on payment patterns, days past due and collection history, and incorporate changes in economic conditions that may not be reflected in historical trends, such as tenants in bankruptcy, liquidation or reorganization. Receivables are written-off against the allowances when they are determined to be uncollectible. Such determination includes analysis and consideration of the particular conditions of the account.
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	282400000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	131000000.0	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	104300000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	157800000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	87200000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	223400000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	6400000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	2100000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	163300000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	282400000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	131000000.0	USD
CY2019	amt	Foreigncurrencytransactiongainlossreclassifiedas Aoci ForeigncurrencytransactiongainlossreclassifiedasAOCI	-45800000	USD
CY2018	amt	Foreigncurrencytransactiongainlossreclassifiedas Aoci ForeigncurrencytransactiongainlossreclassifiedasAOCI	-385800000	USD
CY2017	amt	Foreigncurrencytransactiongainlossreclassifiedas Aoci ForeigncurrencytransactiongainlossreclassifiedasAOCI	-51600000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	6100000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-4500000	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	26400000	USD
CY2019	amt	Foreigncurrencytransactiongainlossin Aoc Iand Income Statement ForeigncurrencytransactiongainlossinAOCIandIncomeStatement	-39700000	USD
CY2018	amt	Foreigncurrencytransactiongainlossin Aoc Iand Income Statement ForeigncurrencytransactiongainlossinAOCIandIncomeStatement	-390300000	USD
CY2017	amt	Foreigncurrencytransactiongainlossin Aoc Iand Income Statement ForeigncurrencytransactiongainlossinAOCIandIncomeStatement	-25200000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1501200000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1208700000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	802100000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	76800000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	96200000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	152800000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1578000000.0	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1304900000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	954900000	USD
CY2019	amt	Labor Costs Capitalized LaborCostsCapitalized	48300000	USD
CY2018	amt	Labor Costs Capitalized LaborCostsCapitalized	55000000.0	USD
CY2017	amt	Labor Costs Capitalized LaborCostsCapitalized	50900000	USD
CY2019	amt	Straight Line Revenue StraightLineRevenue	183500000	USD
CY2018	amt	Straight Line Revenue StraightLineRevenue	87600000	USD
CY2017	amt	Straight Line Revenue StraightLineRevenue	194400000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	527200000	USD
CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	7053100000	USD
CY2019	us-gaap	Revenues Revenues	7580300000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	491300000	USD
CY2018	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	6948800000	USD
CY2018	us-gaap	Revenues Revenues	7440100000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	62200000	USD
CY2018	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	44400000	USD
CY2019	amt	Straight Line Expense StraightLineExpense	44400000	USD
CY2018	amt	Straight Line Expense StraightLineExpense	57900000	USD
CY2017	amt	Straight Line Expense StraightLineExpense	62300000	USD
CY2019	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	2100000	shares
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	1
CY2019	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.05
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11800000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11200000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11000000.0	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	142300000	USD
CY2018Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	126100000	USD
CY2019Q4	us-gaap	Prepaid Taxes PrepaidTaxes	185800000	USD
CY2018Q4	us-gaap	Prepaid Taxes PrepaidTaxes	125100000	USD
CY2019Q4	us-gaap	Value Added Tax Receivable ValueAddedTaxReceivable	71300000	USD
CY2018Q4	us-gaap	Value Added Tax Receivable ValueAddedTaxReceivable	86300000	USD
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	56800000	USD
CY2018Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	40500000	USD
CY2019Q4	amt	Prepaid Operating Ground Leases PrepaidOperatingGroundLeases	0	USD
CY2018Q4	amt	Prepaid Operating Ground Leases PrepaidOperatingGroundLeases	165000000.0	USD
CY2019Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	57400000	USD
CY2018Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	78200000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	513600000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	621200000	USD
CY2019Q4	amt	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	19325600000	USD
CY2019	us-gaap	Depreciation Depreciation	905500000	USD
CY2018	us-gaap	Depreciation Depreciation	883100000	USD
CY2017	us-gaap	Depreciation Depreciation	835500000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	168100000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	17717200000	USD
CY2019Q4	amt	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	7241200000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	6470100000	USD
CY2019Q4	amt	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	12084400000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11247100000	USD
CY2019Q4	amt	Land Easements Non Depreciable LandEasementsNonDepreciable	1575200000	USD
CY2019Q4	amt	Numberof Tenants NumberofTenants	1	tenant
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	5829100000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	5711100000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	5136500000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	4985000000.0	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	4802700000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	20410300000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	46874700000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	5251200000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	5062200000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	4676100000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	3754600000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	3457300000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	12641100000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	34842500000	USD
CY2019	amt	Lessee Operating Lease Number Of Renewal Options LesseeOperatingLeaseNumberOfRenewalOptions	1	renewal_option
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	7357400000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	494500000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	6510400000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	7004900000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	24000000.0	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	30700000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P13Y1M6D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.061
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P15Y
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.062
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	1013100000	USD
CY2019	us-gaap	Variable Lease Payment VariableLeasePayment	261700000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1700000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	1012200000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1700000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	18000000.0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	409500000	USD
CY2019	amt	Non Cash Operating And Financing Lease Modifications NonCashOperatingAndFinancingLeaseModifications	334100000	USD
CY2019	amt	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-60600000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	904300000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	8000000.0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	878300000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	5300000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	845500000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	4300000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	810300000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	3000000.0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	766400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	2100000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	6140100000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	45400000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	10344900000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	68100000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	3340000000.0	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	37400000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	7004900000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	30700000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	494500000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6700000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	6510400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	24000000.0	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	926000000.0	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	904200000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	879800000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	834200000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	792600000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	6173100000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	10509900000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	40700000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	32700000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	27800000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	23700000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	19200000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	117500000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	261600000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	82100000	USD
CY2019Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	179500000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	5638400000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	48200000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-184700000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	5501900000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	702800000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-26400000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	6178300000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	17931600000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	5613200000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	12318400000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	16040900000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	4866600000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11174300000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	791300000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1144100000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	785900000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	885700000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	860100000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	856000000.0	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	852400000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	838100000	USD
CY2019Q4	amt	Prepaid Long Term Operating Ground Leases PrepaidLongTermOperatingGroundLeases	0	USD
CY2018Q4	amt	Prepaid Long Term Operating Ground Leases PrepaidLongTermOperatingGroundLeases	607500000	USD
CY2019Q4	us-gaap	Long Term Accounts Notes And Loans Receivable Net Noncurrent LongTermAccountsNotesAndLoansReceivableNetNoncurrent	1100000	USD
CY2018Q4	us-gaap	Long Term Accounts Notes And Loans Receivable Net Noncurrent LongTermAccountsNotesAndLoansReceivableNetNoncurrent	1000000.0	USD
CY2019Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	405300000	USD
CY2018Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	354100000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	406400000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	962600000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	26900000	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	14100000	USD
CY2017	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	16300000	USD
CY2019	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	9800000	USD
CY2018	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	16100000	USD
CY2017	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	11500000	USD
CY2019	us-gaap	Proceeds From Previous Acquisition ProceedsFromPreviousAcquisition	13100000	USD
CY2019	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	17600000	USD
CY2019	amt	Business Combination Pro Forma Information Gross Margin Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationGrossMarginOfAcquireeSinceAcquisitionDateActual	12700000	USD
CY2019	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	7904200000	USD
CY2018	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	7936000000.0	USD
CY2019	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	1844900000	USD
CY2018	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	1122600000	USD
CY2019	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	4.17
CY2018	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	2.55
CY2019	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	4.14
CY2018	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	2.53
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	2754800000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	21127200000	USD
CY2018Q4	amt	Accrued Property And Real Estate Taxes AccruedPropertyAndRealEstateTaxes	169700000	USD
CY2019Q4	amt	Accrued Pass Through Costs AccruedPassThroughCosts	74200000	USD
CY2018Q4	amt	Accrued Pass Through Costs AccruedPassThroughCosts	71200000	USD
CY2019Q4	srt	Payables To Customers PayablesToCustomers	77900000	USD
CY2019Q4	amt	Accrued Property And Real Estate Taxes AccruedPropertyAndRealEstateTaxes	198100000	USD
CY2018Q4	srt	Payables To Customers PayablesToCustomers	93500000	USD
CY2019Q4	us-gaap	Accrued Rent Current AccruedRentCurrent	75600000	USD
CY2018Q4	us-gaap	Accrued Rent Current AccruedRentCurrent	61400000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	102400000	USD
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	90400000	USD
CY2019Q4	us-gaap	Construction Payable Current ConstructionPayableCurrent	27800000	USD
CY2018Q4	us-gaap	Construction Payable Current ConstructionPayableCurrent	41500000	USD
CY2019Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	55200000	USD
CY2018Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	57900000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	347000000.0	USD
CY2018Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	362700000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	958200000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	948300000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	30700000	USD
CY2018Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	179500000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	24055400000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	21159900000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	2928200000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	18405100000	USD
CY2019	amt	Numberof Annual Renewal Periods NumberofAnnualRenewalPeriods	2	renewal_period
CY2018Q1	amt	Number Of Trust Sites Assets NumberOfTrustSitesAssets	5114	site
CY2019	amt	Debt Instrument Payment Terms Repayment Period DebtInstrumentPaymentTermsRepaymentPeriod	P12M
CY2019	amt	Business Combination Contingent Consideration Liability Installment Payment Period BusinessCombinationContingentConsiderationLiabilityInstallmentPaymentPeriod	P3Y
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	30700000	USD
CY2017Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	179500000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	2928200000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1446600000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1339000000.0	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	3722800000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1651200000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	13111900000	USD
CY2019Q4	amt	Long Term Debt Total Cash Obligations LongTermDebtTotalCashObligations	24199700000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	144300000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	24055400000	USD
CY2018Q4	us-gaap	Deferred Rent Credit Noncurrent DeferredRentCreditNoncurrent	506700000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	525900000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	504600000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	411100000	USD
CY2018Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	253800000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	937000000.0	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1265100000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1210000000.0	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1175300000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	61800000	USD
CY2019	us-gaap	Asset Retirement Obligation Foreign Currency Translation Gain Loss AssetRetirementObligationForeignCurrencyTranslationGainLoss	6700000	USD
CY2018	us-gaap	Asset Retirement Obligation Foreign Currency Translation Gain Loss AssetRetirementObligationForeignCurrencyTranslationGainLoss	49400000	USD
CY2019Q4	amt	Estimated Undiscounted Future Cash Outlay For Asset Retirement Obligations EstimatedUndiscountedFutureCashOutlayForAssetRetirementObligations	3200000000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	39600000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	81600000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	83600000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	56800000	USD
CY2018	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-81500000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	26100000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	7000000.0	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1384100000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1210000000.0	USD
CY2015Q3	us-gaap	Embedded Derivative Fair Value Of Embedded Derivative Asset EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset	14600000	USD
CY2019Q4	amt	Assets Heldand Used Long Lived Fair Value Disclosure AssetsHeldandUsedLongLivedFairValueDisclosure	22400000000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	94200000	USD
CY2018Q4	amt	Assets Heldand Used Long Lived Fair Value Disclosure AssetsHeldandUsedLongLivedFairValueDisclosure	22400000000	USD
CY2018	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	394000000.0	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	24100000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	21200000000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1700000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1400000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	100000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5000000.0	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1800000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3800000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	48200000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	189700000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	113400000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1400000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-4000000.0	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-200000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-500000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-700000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1000000.0	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-53200000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-298300000	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-85400000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2019	amt	Tax Adjustment Related To Reit TaxAdjustmentRelatedToReit	0.21
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CY2017	amt	Tax Adjustment Related To Reit TaxAdjustmentRelatedToReit	0.35
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.03
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CY2018	amt	Effective Income Tax Rate Reconciliation Mipt EffectiveIncomeTaxRateReconciliationMIPT	-0.06
CY2017	amt	Effective Income Tax Rate Reconciliation Mipt EffectiveIncomeTaxRateReconciliationMIPT	0
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-200000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-110100000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30700000	USD
CY2019	us-gaap	Other Tax Expense Benefit OtherTaxExpenseBenefit	-113000000.0	USD
CY2018	us-gaap	Other Tax Expense Benefit OtherTaxExpenseBenefit	-85700000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Asset Provisional Income Tax Expense TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense	2400000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.01
CY2019	amt	Foreign Withholding Taxes ForeignWithholdingTaxes	0.03
CY2018	amt	Foreign Withholding Taxes ForeignWithholdingTaxes	0.04
CY2017	amt	Foreign Withholding Taxes ForeignWithholdingTaxes	0.03
CY2019	amt	Effective Income Tax Rate Reconciliation Tax Reserves EffectiveIncomeTaxRateReconciliationTaxReserves	0.01
CY2018	amt	Effective Income Tax Rate Reconciliation Tax Reserves EffectiveIncomeTaxRateReconciliationTaxReserves	0
CY2017	amt	Effective Income Tax Rate Reconciliation Tax Reserves EffectiveIncomeTaxRateReconciliationTaxReserves	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.06
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.02
CY2019	amt	Effective Income Tax Rate Reconciliation Mipt EffectiveIncomeTaxRateReconciliationMIPT	-0.01
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.10
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.02
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1527000000.0	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1212700000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	971200000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	389400000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-58100000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	284900000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1916400000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1154600000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1256100000	USD
CY2019Q4	amt	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	878500000	USD
CY2019Q4	amt	Net Long Term Operating Loss Carry Forwards NetLongTermOperatingLossCarryForwards	356600000	USD
CY2018Q4	amt	Net Long Term Operating Loss Carry Forwards NetLongTermOperatingLossCarryForwards	264900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	174900000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	165700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	6300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	31700000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	28300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	3800000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	12900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	65600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	78600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	26100000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	26200000	USD
CY2019Q4	amt	Deferred Tax Liability Depreciation And Amortization DeferredTaxLiabilityDepreciationAndAmortization	1040300000	USD
CY2018Q4	amt	Deferred Tax Liability Depreciation And Amortization DeferredTaxLiabilityDepreciationAndAmortization	757000000.0	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	144400000	USD
CY2019	amt	Valuation Allowance Deferred Tax Asset Increase ValuationAllowanceDeferredTaxAssetIncrease	42500000	USD
CY2018	amt	Valuation Allowance Deferred Tax Asset Increase ValuationAllowanceDeferredTaxAssetIncrease	15700000	USD
CY2019Q4	amt	Deferred Tax Liabilities Rightof Use Asset DeferredTaxLiabilitiesRightofUseAsset	865100000	USD
CY2019Q4	amt	Deferred Tax Deferred Rent Noncurrent DeferredTaxDeferredRentNoncurrent	79700000	USD
CY2018Q4	amt	Deferred Tax Deferred Rent Noncurrent DeferredTaxDeferredRentNoncurrent	36900000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	15300000	USD
CY2019Q4	amt	Deferred Tax Liabilities Assets Gross DeferredTaxLiabilitiesAssetsGross	442300000	USD
CY2018Q4	amt	Deferred Tax Liabilities Assets Gross DeferredTaxLiabilitiesAssetsGross	226300000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	194200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	151900000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	636500000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	378200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	194200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	151900000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	151900000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	142000000.0	USD
CY2017	amt	Valuation Allowance Deferred Tax Asset Increase ValuationAllowanceDeferredTaxAssetIncrease	11600000	USD
CY2019	amt	Valuation Allowance Deferred Tax Asset Decrease ValuationAllowanceDeferredTaxAssetDecrease	0	USD
CY2018	amt	Valuation Allowance Deferred Tax Asset Decrease ValuationAllowanceDeferredTaxAssetDecrease	0	USD
CY2017	amt	Valuation Allowance Deferred Tax Asset Decrease ValuationAllowanceDeferredTaxAssetDecrease	9100000	USD
CY2019	amt	Valuation Allowance Deferred Tax Asset Increase Decreaserelatedtoforeigncurrency ValuationAllowanceDeferredTaxAssetIncreaseDecreaserelatedtoforeigncurrency	-200000	USD
CY2018	amt	Valuation Allowance Deferred Tax Asset Increase Decreaserelatedtoforeigncurrency ValuationAllowanceDeferredTaxAssetIncreaseDecreaserelatedtoforeigncurrency	-5800000	USD
CY2017	amt	Valuation Allowance Deferred Tax Asset Increase Decreaserelatedtoforeigncurrency ValuationAllowanceDeferredTaxAssetIncreaseDecreaserelatedtoforeigncurrency	-4900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	194200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	151900000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	142000000.0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	107700000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	116700000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	107600000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	33300000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	6700000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	175600000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	107700000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	116700000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	8100000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	7600000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	37500000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	300000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2019	amt	Unrecognized Tax Benefits Reduction Resultingfrom Lapseof Applicable Statueof Limitationsand Effective Settlements UnrecognizedTaxBenefitsReductionResultingfromLapseofApplicableStatueofLimitationsandEffectiveSettlements	2500000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	158100000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	93700000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	72000000.0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation	1600000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation	8100000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation	1900000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1300000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2600000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2017	amt	Unrecognized Tax Benefits Decrease In Income Tax Penalties And Interest Expense Resulting From Expiration Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsDecreaseInIncomeTaxPenaltiesAndInterestExpenseResultingFromExpirationOfApplicableStatuteOfLimitations	600000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	26600000	USD
CY2018	amt	Unrecognized Tax Benefits Reduction Resultingfrom Lapseof Applicable Statueof Limitationsand Effective Settlements UnrecognizedTaxBenefitsReductionResultingfromLapseofApplicableStatueofLimitationsandEffectiveSettlements	9300000	USD
CY2017	amt	Unrecognized Tax Benefits Reduction Resultingfrom Lapseof Applicable Statueof Limitationsand Effective Settlements UnrecognizedTaxBenefitsReductionResultingfromLapseofApplicableStatueofLimitationsandEffectiveSettlements	400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	10300000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	8000000.0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	5000000.0	USD
CY2019	amt	Unrecognized Tax Benefits Decrease In Income Tax Penalties And Interest Expense Resulting From Expiration Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsDecreaseInIncomeTaxPenaltiesAndInterestExpenseResultingFromExpirationOfApplicableStatuteOfLimitations	2700000	USD
CY2018	amt	Unrecognized Tax Benefits Decrease In Income Tax Penalties And Interest Expense Resulting From Expiration Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsDecreaseInIncomeTaxPenaltiesAndInterestExpenseResultingFromExpirationOfApplicableStatuteOfLimitations	16200000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	19100000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Discount From Market Price Purchase Date ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate	0.15
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	111400000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	137500000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	108500000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1600000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2000000.0	USD
CY2017	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1600000	USD
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	700000	USD
CY2019Q4	us-gaap	Temporary Equity Redemption Price Per Share TemporaryEquityRedemptionPricePerShare	216
CY2019Q2	us-gaap	Redeemable Noncontrolling Interest Equity Other Redemption Value RedeemableNoncontrollingInterestEquityOtherRedemptionValue	24800000000	INR
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Redemption Value RedeemableNoncontrollingInterestEquityOtherRedemptionValue	347600000	USD
CY2019	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	523000000.0	INR
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	1004800000	USD
CY2017Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	1126200000	USD
CY2016Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	1091300000	USD
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-35800000	USD
CY2018	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	87900000	USD
CY2017	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	33400000	USD
CY2019	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-35800000	USD
CY2018	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	86700000	USD
CY2017	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	0	USD
CY2019	amt	Noncontrollinginterestdecreaseduetomerger Noncontrollinginterestdecreaseduetomerger	0	USD
CY2018	amt	Noncontrollinginterestdecreaseduetomerger Noncontrollinginterestdecreaseduetomerger	-28100000	USD
CY2017	amt	Noncontrollinginterestdecreaseduetomerger Noncontrollinginterestdecreaseduetomerger	0	USD
CY2019	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	425700000	USD
CY2019	us-gaap	Temporary Equity Foreign Currency Translation Adjustments TemporaryEquityForeignCurrencyTranslationAdjustments	-8300000	USD
CY2018	us-gaap	Temporary Equity Foreign Currency Translation Adjustments TemporaryEquityForeignCurrencyTranslationAdjustments	-92100000	USD
CY2017	us-gaap	Temporary Equity Foreign Currency Translation Adjustments TemporaryEquityForeignCurrencyTranslationAdjustments	68300000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	1096500000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	1004800000	USD
CY2017Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	1126200000	USD
CY2019	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	105500000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	19600000	USD
CY2019Q4	amt	Accrued Dividend Rsu AccruedDividendRsu	14300000	USD
CY2018Q4	amt	Accrued Dividend Rsu AccruedDividendRsu	13700000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	94200000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	394000000.0	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	211400000	USD
CY2019	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-45100000	USD
CY2018	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-85600000	USD
CY2017	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-32800000	USD
CY2019	amt	Other Operating Expenses OtherOperatingExpenses	27000000.0	USD
CY2018	amt	Other Operating Expenses OtherOperatingExpenses	33700000	USD
CY2017	amt	Other Operating Expenses OtherOperatingExpenses	11800000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	166300000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	513300000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	256000000.0	USD
CY2019	us-gaap	Proceeds From Previous Acquisition ProceedsFromPreviousAcquisition	13100000	USD
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	442960000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	431688000	shares
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1227000000.0	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1151500000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	442319000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	439606000	shares
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	94200000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	394000000.0	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	211400000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1887800000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1236400000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	1238900000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	9400000	USD
CY2017	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	87400000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1887800000	USD
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	428181000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	3201000	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	3354000	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	3507000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	445520000	shares
CY2018	amt	Fair Value Of Debt Assumed Through Acquisitions FairValueOfDebtAssumedThroughAcquisitions	0	USD
CY2019	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	0	USD
CY2018	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	0	USD
CY2017	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	48200000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.27
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	54200000	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0	USD
CY2017	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	54800000	USD
CY2019	amt	Fair Value Of Debt Assumed Through Acquisitions FairValueOfDebtAssumedThroughAcquisitions	329800000	USD
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.79
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.69
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.24
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.77
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.67
CY2016Q4	amt	Loss Contingency Foreign Income Tax Assessment LossContingencyForeignIncomeTaxAssessment	4750000000	INR
CY2016Q4	amt	Loss Contingency Foreign Income Tax Assessment LossContingencyForeignIncomeTaxAssessment	69800000	USD
CY2019Q4	amt	Changeinreportablesegmentsbreakoutof Emea ChangeinreportablesegmentsbreakoutofEMEA	2	segment
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CY2019	us-gaap	Interest Paid Net InterestPaidNet	750200000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	789700000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	712100000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	147500000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	163900000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	136500000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	-21000000.0	USD
CY2019Q4	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	6	segment
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	111400000	USD
CY2019	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	156500000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1778400000	USD
CY2019	us-gaap	Other Expenses OtherExpenses	938300000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1916400000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	137500000	USD
CY2018	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	156100000	USD
CY2018	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	2110800000	USD
CY2018	us-gaap	Other Expenses OtherExpenses	1263600000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	8300000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	34000000.0	USD
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	81300000	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1038900000	USD
CY2019	amt	Finance Lease Payments Financing Activities FinanceLeasePaymentsFinancingActivities	18000000.0	USD
CY2019	amt	Payments For Perpetual Land Easements PaymentsForPerpetualLandEasements	29600000	USD
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	57800000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1154600000	USD
CY2017	amt	Fair Value Of Debt Assumed Through Acquisitions FairValueOfDebtAssumedThroughAcquisitions	0	USD
CY2019	amt	Settlement Of Accounts Receivable Due To Acquisition SettlementOfAccountsReceivableDueToAcquisition	0	USD
CY2018	amt	Settlement Of Accounts Receivable Due To Acquisition SettlementOfAccountsReceivableDueToAcquisition	24800000	USD
CY2017	amt	Settlement Of Accounts Receivable Due To Acquisition SettlementOfAccountsReceivableDueToAcquisition	0	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	945200000	USD
CY2018	us-gaap	Repayments Of Debt And Capital Lease Obligations RepaymentsOfDebtAndCapitalLeaseObligations	32000000.0	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	108500000	USD
CY2017	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	138500000	USD
CY2017	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1715900000	USD
CY2017	us-gaap	Other Expenses OtherExpenses	1009100000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1256100000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	835400000	USD
CY2017	us-gaap	Repayments Of Debt And Capital Lease Obligations RepaymentsOfDebtAndCapitalLeaseObligations	31800000	USD
CY2019Q4	us-gaap	Assets Assets	42801600000	USD
CY2018Q4	us-gaap	Assets Assets	33010400000	USD
CY2017Q4	us-gaap	Assets Assets	33214300000	USD
CY2019	us-gaap	Revenues Revenues	7580300000	USD
CY2018	us-gaap	Revenues Revenues	7440100000	USD
CY2017	us-gaap	Revenues Revenues	6663900000	USD
CY2019Q4	us-gaap	Noncurrent Assets NoncurrentAssets	30581100000	USD
CY2018Q4	us-gaap	Noncurrent Assets NoncurrentAssets	27923300000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	569400000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1916600000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	397400000	USD
CY2019Q1	us-gaap	Revenues Revenues	1813400000	USD
CY2019Q2	us-gaap	Revenues Revenues	1889600000	USD
CY2019Q3	us-gaap	Revenues Revenues	1953600000	USD
CY2019Q4	us-gaap	Revenues Revenues	1923700000	USD
CY2019	us-gaap	Revenues Revenues	7580300000	USD
CY2019Q1	amt	Cost Of Operations CostOfOperations	543400000	USD
CY2019Q2	amt	Cost Of Operations CostOfOperations	563300000	USD
CY2019Q3	amt	Cost Of Operations CostOfOperations	559900000	USD
CY2019Q4	amt	Cost Of Operations CostOfOperations	550200000	USD
CY2019	amt	Cost Of Operations CostOfOperations	2216800000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	614900000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	683900000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	728300000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	661300000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	2688400000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	407600000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	434300000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	505300000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	429100000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	498600000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	562700000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1887800000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	397400000	USD
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CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	498600000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	562700000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1887800000	USD
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CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.26
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CY2018Q1	us-gaap	Revenues Revenues	1741800000	USD
CY2018Q2	us-gaap	Revenues Revenues	1780900000	USD
CY2018Q3	us-gaap	Revenues Revenues	1785500000	USD
CY2018Q4	us-gaap	Revenues Revenues	2131900000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	377300000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	292700000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1264700000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	285200000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	306700000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	366900000	USD
CY2018	us-gaap	Revenues Revenues	7440100000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	277600000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1236400000	USD
CY2018Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	9400000	USD
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CY2018Q4	amt	Cost Of Operations CostOfOperations	540900000	USD
CY2018	amt	Cost Of Operations CostOfOperations	2177800000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	402900000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	546000000.0	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	567200000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	388900000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1905000000.0	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	280300000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	314400000	USD
CY2018Q3	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	USD
CY2018Q4	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	9400000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	275800000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	306700000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	366900000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	277600000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1227000000.0	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.63
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.69
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.83
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.63
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.79
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.63
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.83
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.77
CY2019	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	45200000	USD
CY2018	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	-3000000.0	USD
CY2017	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	106400000	USD
CY2019	amt	Real Estate Period Additions To Cost RealEstatePeriodAdditionsToCost	1826200000	USD
CY2017	amt	Start Up Capital Expenditures StartUpCapitalExpenditures	158100000	USD
CY2019	srt	Sec Schedule Iii Real Estate Number Of Units SECScheduleIIIRealEstateNumberOfUnits	177746	communication_site
CY2019Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	2736500000	USD
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	17429300000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	6382200000	USD
CY2019	amt	Real Estate Date Of Construction RealEstateDateOfConstruction	Various
CY2019	amt	Real Estate Date Acquired RealEstateDateAcquired	Various
CY2018Q4	amt	Percentage Of Gross Amounts Maximum PercentageOfGrossAmountsMaximum	0.05
CY2018Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	2700000000	USD
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	15960100000	USD
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	15349000000.0	USD
CY2016Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	14277000000.0	USD
CY2019	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	887000000.0	USD
CY2018	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	721400000	USD
CY2017	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	499700000	USD
CY2019	amt	Discretionary Capital Projects DiscretionaryCapitalProjects	258100000	USD
CY2018	amt	Discretionary Capital Projects DiscretionaryCapitalProjects	173500000	USD
CY2017	amt	Discretionary Capital Projects DiscretionaryCapitalProjects	120700000	USD
CY2019	amt	Discretionary Ground Lease Purchases DiscretionaryGroundLeasePurchases	189800000	USD
CY2018	amt	Discretionary Ground Lease Purchases DiscretionaryGroundLeasePurchases	180400000	USD
CY2017	amt	Discretionary Ground Lease Purchases DiscretionaryGroundLeasePurchases	150400000	USD
CY2019	amt	Redevelopment Capital Expenditures RedevelopmentCapitalExpenditures	213600000	USD
CY2018	amt	Redevelopment Capital Expenditures RedevelopmentCapitalExpenditures	177300000	USD
CY2017	amt	Redevelopment Capital Expenditures RedevelopmentCapitalExpenditures	138800000	USD
CY2019	us-gaap	Real Estate Improvements RealEstateImprovements	161200000	USD
CY2018	us-gaap	Real Estate Improvements RealEstateImprovements	94000000.0	USD
CY2017	us-gaap	Real Estate Improvements RealEstateImprovements	65600000	USD
CY2019	amt	Start Up Capital Expenditures StartUpCapitalExpenditures	71300000	USD
CY2018	amt	Start Up Capital Expenditures StartUpCapitalExpenditures	113100000	USD
CY2018	amt	Real Estate Period Additions To Cost RealEstatePeriodAdditionsToCost	1456700000	USD
CY2017	amt	Real Estate Period Additions To Cost RealEstatePeriodAdditionsToCost	1239700000	USD
CY2019	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	304600000	USD
CY2018	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	395700000	USD
CY2017	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	246500000	USD
CY2019	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	52400000	USD
CY2018	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	449900000	USD
CY2017	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	-78800000	USD
CY2019	amt	Real Estate Period Deductions To Cost RealEstatePeriodDeductionsToCost	357000000.0	USD
CY2018	amt	Real Estate Period Deductions To Cost RealEstatePeriodDeductionsToCost	845600000	USD
CY2017	amt	Real Estate Period Deductions To Cost RealEstatePeriodDeductionsToCost	167700000	USD
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	17429300000	USD
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	15960100000	USD
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	15349000000.0	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	5724700000	USD
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	5181200000	USD
CY2016Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	4548100000	USD
CY2019	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	768400000	USD
CY2018	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	751400000	USD
CY2017	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	718700000	USD
CY2019	us-gaap	Real Estate Accumulated Depreciation Other Additions RealEstateAccumulatedDepreciationOtherAdditions	0	USD
CY2018	us-gaap	Real Estate Accumulated Depreciation Other Additions RealEstateAccumulatedDepreciationOtherAdditions	0	USD
CY2017	us-gaap	Real Estate Accumulated Depreciation Other Additions RealEstateAccumulatedDepreciationOtherAdditions	0	USD
CY2019	amt	Real Estate Period Additions To Accumulated Depreciation RealEstatePeriodAdditionsToAccumulatedDepreciation	768400000	USD
CY2018	amt	Real Estate Period Additions To Accumulated Depreciation RealEstatePeriodAdditionsToAccumulatedDepreciation	751400000	USD
CY2017	amt	Real Estate Period Additions To Accumulated Depreciation RealEstatePeriodAdditionsToAccumulatedDepreciation	718700000	USD
CY2019	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	121400000	USD
CY2018	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	129300000	USD
CY2017	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	100700000	USD
CY2019	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	-10500000	USD
CY2018	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	78600000	USD
CY2017	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	-15100000	USD
CY2019	amt	Real Estate Period Deductions To Accumulated Depreciation RealEstatePeriodDeductionsToAccumulatedDepreciation	110900000	USD
CY2018	amt	Real Estate Period Deductions To Accumulated Depreciation RealEstatePeriodDeductionsToAccumulatedDepreciation	207900000	USD
CY2017	amt	Real Estate Period Deductions To Accumulated Depreciation RealEstatePeriodDeductionsToAccumulatedDepreciation	85600000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	6382200000	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	5724700000	USD
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	5181200000	USD

Files In Submission

Name	View Source	Status
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0001053507-20-000028-index.html	Edgar Link	pending
0001053507-20-000028.txt	Edgar Link	pending
0001053507-20-000028-xbrl.zip	Edgar Link	pending
amt-20191231.xsd	Edgar Link	pending
amt-20191231_cal.xml	Edgar Link	unprocessable
amt-20191231_def.xml	Edgar Link	unprocessable
amt-20191231_lab.xml	Edgar Link	unprocessable
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$AMT
AMERICAN TOWER CORP /MA/ Stock $amt

2019 Q4 Form 10-K Financial Statement

#000105350720000028 Filed on February 25, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMT AMERICAN TOWER CORP /MA/ Stock $amt

2019 Q4 Form 10-K Financial Statement

#000105350720000028 Filed on February 25, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMT
AMERICAN TOWER CORP /MA/ Stock $amt