$AMT
AMERICAN TOWER CORP /MA/ Stock $amt

$amt Overview Financials Valuation SEC Filings Company Website

2020 Form 10-K Financial Statement

#000105350721000026 Filed on February 25, 2021

Income Statement

Concept	2020	2019 Q4	2019
Revenue	$8.042B	$1.924B	$7.580B
YoY Change	6.08%	-9.77%	1.88%
Cost Of Revenue	$2.227B	$550.2M	$43.10M
YoY Change	5067.52%	1.72%	-12.22%
Gross Profit	$5.814B	$1.374B	$7.537B
YoY Change	-22.86%	-13.67%	1.98%
Gross Profit Margin	72.3%	71.4%	99.43%
Selling, General & Admin	$778.7M	$179.6M	$730.4M
YoY Change	6.61%	-6.7%	-0.38%
% of Gross Profit	13.39%	13.08%	9.69%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$924.3M	$449.8M	$905.5M
YoY Change	2.08%	-41.27%	2.54%
% of Gross Profit	15.9%	32.75%	12.01%
Operating Expenses	$778.7M	$549.7M	$730.4M
YoY Change	6.61%	-54.18%	-0.38%
Operating Profit	$2.888B	$661.3M	$2.688B
YoY Change	7.41%	70.04%	41.12%
Interest Expense	$793.5M	-$198.0M	$814.2M
YoY Change	-2.54%	1.18%	-1.37%
% of Operating Profit	27.48%	-29.94%	30.29%
Other Income/Expense, Net	-$1.066B	$5.600M	-$772.0M
YoY Change	38.13%	-24.32%	2.88%
Pretax Income	$1.821B	$468.9M	$1.916B
YoY Change	-4.97%	137.66%	58.03%
Income Tax	$129.6M	-$100.5M	-$200.0K
% Of Pretax Income	7.12%	-21.43%	-0.01%
Net Earnings	$1.691B	$562.7M	$1.888B
YoY Change	-10.45%	102.7%	52.69%
Net Earnings / Revenue	21.02%	29.25%	24.9%
Basic Earnings Per Share	$3.81	$1.27	$4.27
Diluted Earnings Per Share	$3.79	$1.26	$4.24
COMMON SHARES
Basic Shares Outstanding	443.6M shares	442.9M shares	442.3M shares
Diluted Shares Outstanding	446.1M shares		445.5M shares

Balance Sheet

Concept	2020	2019 Q4	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.746B	$1.501B	$1.501B
YoY Change	16.32%	24.15%	24.15%
Cash & Equivalents	$1.746B	$1.501B	$1.501B
Short-Term Investments
Other Short-Term Assets	$405.0M	$377.0M	$377.0M
YoY Change	7.43%	-25.35%	-25.35%
Inventory
Prepaid Expenses		$56.80M
Receivables	$512.0M	$462.2M	$462.0M
Other Receivables	$243.0M	$214.0M	$214.0M
Total Short-Term Assets	$2.906B	$2.554B	$2.554B
YoY Change	13.78%	7.07%	7.09%
LONG-TERM ASSETS
Property, Plant & Equipment	$20.60B	$19.44B	$19.44B
YoY Change	5.95%	72.86%	72.86%
Goodwill		$6.178B
YoY Change		12.29%
Intangibles		$12.32B
YoY Change		10.24%
Long-Term Investments
YoY Change
Other Assets	$2.207B	$406.4M	$1.903B
YoY Change	15.97%	-57.78%	9.43%
Total Long-Term Assets	$44.33B	$40.25B	$40.25B
YoY Change	10.14%	31.42%	31.42%
TOTAL ASSETS
Total Short-Term Assets	$2.906B	$2.554B	$2.554B
Total Long-Term Assets	$44.33B	$40.25B	$40.25B
Total Assets	$47.23B	$42.80B	$42.80B
YoY Change	10.35%	29.66%	29.66%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$198.0M	$148.1M	$148.0M
YoY Change	33.78%	13.23%	12.98%
Accrued Expenses	$1.646B	$958.2M	$1.529B
YoY Change	7.65%	1.04%	57.47%
Deferred Revenue		$294.3M
YoY Change		-3.22%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$790.0M	$2.928B	$2.928B
YoY Change	-73.02%	6.29%	6.28%
Total Short-Term Liabilities	$3.656B	$5.488B	$5.488B
YoY Change	-33.38%	17.01%	17.01%
LONG-TERM LIABILITIES
Long-Term Debt	$28.50B	$21.13B	$21.13B
YoY Change	34.89%	14.79%	14.79%
Other Long-Term Liabilities	$9.440B	$937.0M	$8.832B
YoY Change	6.88%	-25.93%	256.85%
Total Long-Term Liabilities	$37.94B	$937.0M	$29.96B
YoY Change	26.63%	-95.24%	43.48%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.656B	$5.488B	$5.488B
Total Long-Term Liabilities	$37.94B	$937.0M	$29.96B
Total Liabilities	$43.14B	$36.21B	$37.75B
YoY Change	14.29%	38.72%	36.4%
SHAREHOLDERS EQUITY
Retained Earnings		-$1.017B
YoY Change		-15.23%
Common Stock		$4.500M
YoY Change		0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$1.226B
YoY Change		1.62%
Treasury Stock Shares		10.65M shares
Shareholders Equity	$4.094B	$5.055B	$5.055B
YoY Change
Total Liabilities & Shareholders Equity	$47.23B	$42.80B	$42.80B
YoY Change	10.35%	29.66%	29.66%

Cashflow Statement

Concept	2020	2019 Q4	2019
OPERATING ACTIVITIES
Net Income	$1.691B	$562.7M	$1.888B
YoY Change	-10.45%	102.7%	52.69%
Depreciation, Depletion And Amortization	$924.3M	$449.8M	$905.5M
YoY Change	2.08%	-41.27%	2.54%
Cash From Operating Activities	$3.881B	$993.7M	$3.753B
YoY Change	3.43%	-21.33%	0.11%
INVESTING ACTIVITIES
Capital Expenditures	$1.032B	-$266.7M	$991.3M
YoY Change	4.08%	-11.92%	8.55%
Acquisitions	$3.799B		$2.960B
YoY Change	28.37%		57.31%
Other Investing Activities	-$26.60M	-$2.320B	$64.20M
YoY Change	-141.43%	492.44%	21.59%
Cash From Investing Activities	-$4.785B	-$2.587B	-$3.988B
YoY Change	19.99%	272.51%	45.03%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$56.00M		$19.60M
YoY Change	185.71%		-91.58%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$1.215B	1.696B	$521.7M
YoY Change	132.95%	-395.83%	-185.85%
NET CHANGE
Cash From Operating Activities	$3.881B	993.7M	$3.753B
Cash From Investing Activities	-$4.785B	-2.587B	-$3.988B
Cash From Financing Activities	$1.215B	1.696B	$521.7M
Net Change In Cash	$283.4M	103.3M	$273.1M
YoY Change	3.77%	-2345.65%	-21.97%
FREE CASH FLOW
Cash From Operating Activities	$3.881B	$993.7M	$3.753B
Capital Expenditures	$1.032B	-$266.7M	$991.3M
Free Cash Flow	$2.850B	$1.260B	$2.761B
YoY Change	3.2%	-19.51%	-2.6%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2020	dei	Amendment Flag AmendmentFlag	false
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CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P3Y
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P3Y
CY2020Q4	amt	Preferred Stock Depositary Shares Percentageof Preferred Shares PreferredStockDepositarySharesPercentageofPreferredShares	0.10	shares
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-14195
CY2020	dei	Entity Registrant Name EntityRegistrantName	American Tower Corporation
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	65-0723837
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	116 Huntington Avenue
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Boston
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	MA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	02116
CY2020	dei	City Area Code CityAreaCode	617
CY2020	dei	Local Phone Number LocalPhoneNumber	375-7500
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CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-750400000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1821100000	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
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	129600000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-200000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-110100000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	1691500000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1916600000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1264700000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	900000	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
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1690600000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1887800000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1236400000	USD
CY2020	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	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
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1690600000	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
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.81
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.27
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.79
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.79
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.24
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.77
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	443640000	shares
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
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	446104000	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
CY2020	us-gaap	Profit Loss ProfitLoss	1691500000	USD
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 Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
CY2020	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
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-200000	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
CY2019	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
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-300000	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
CY2020	amt	Other Comprehensive Income Loss Redeemable Noncontrolling Interest Adjustment Net Of Tax OtherComprehensiveIncomeLossRedeemableNoncontrollingInterestAdjustmentNetOfTax	0	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
CY2020	amt	Other Comprehensive Income Loss Purchase Of Noncontrolling Interest Net Of Tax OtherComprehensiveIncomeLossPurchaseOfNoncontrollingInterestNetOfTax	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
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0.0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	500000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-2600000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-701500000	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
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-701400000	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
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	990100000	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
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	26100000	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
CY2020	amt	Comprehensive Income Loss Net Of Tax Attributable To Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest	209200000	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
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	754800000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1707100000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	571800000	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	amt	Noncontrollinginterestdecreaseduetomerger Noncontrollinginterestdecreaseduetomerger	-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
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	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1680400000	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
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	133500000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	13400000	USD
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	56000000.0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-200000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-300000	USD
CY2020	amt	Other Comprehensive Income Loss Foreign Currency Transactionand Translation Adjustment Netof Tax Less Amount Reclassifiedto Additional Paidin Capital OtherComprehensiveIncomeLossForeignCurrencyTransactionandTranslationAdjustmentNetofTaxLessAmountReclassifiedtoAdditionalPaidinCapital	-686200000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	8900000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Increase In Carrying Amount Of Redeemable Preferred Stock AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	0	USD
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2016800000	USD
CY2020	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	1698900000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4568400000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	1691500000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1916600000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1264700000	USD
CY2020	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1882300000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1778400000	USD
CY2018	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	2110800000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	120800000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	111400000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	137500000	USD
CY2020	amt	Loss Gain On Investments And Other Non Cash Income Expense LossGainOnInvestmentsAndOtherNonCashIncomeExpense	299600000	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
CY2020	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	239500000	USD
CY2019	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	140000000.0	USD
CY2018	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	479600000	USD
CY2020	us-gaap	Extinguishment Of Debt Gain Loss Net Of Tax ExtinguishmentOfDebtGainLossNetOfTax	-71800000	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
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	32900000	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
CY2020	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-22500000	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
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	175500000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-12500000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	32100000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-84400000	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
CY2020	us-gaap	Straight Line Rent StraightLineRent	322000000.0	USD
CY2019	us-gaap	Straight Line Rent StraightLineRent	183500000	USD
CY2018	us-gaap	Straight Line Rent StraightLineRent	87600000	USD
CY2020	amt	Increase Decrease In Right Of Use Asset And Operating Lease Liability IncreaseDecreaseInRightOfUseAssetAndOperatingLeaseLiability	10900000	USD
CY2019	amt	Increase Decrease In Right Of Use Asset And Operating Lease Liability IncreaseDecreaseInRightOfUseAssetAndOperatingLeaseLiability	-17400000	USD
CY2018	amt	Increase Decrease In Right Of Use Asset And Operating Lease Liability IncreaseDecreaseInRightOfUseAssetAndOperatingLeaseLiability	0	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-69200000	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
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-1800000	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
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	60700000	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
CY2020	amt	Increase Decrease In Deferred Rent Liability IncreaseDecreaseInDeferredRentLiability	0	USD
CY2019	amt	Increase Decrease In Deferred Rent Liability IncreaseDecreaseInDeferredRentLiability	0	USD
CY2018	amt	Increase Decrease In Deferred Rent Liability IncreaseDecreaseInDeferredRentLiability	-57900000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-200000	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
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3881400000	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
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1031700000	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
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	3799100000	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
CY2020	amt	Proceeds From Sale Of Available For Sale Securities And Other Productive Assets ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets	19600000	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
CY2020	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	0	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
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-26600000	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
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-4784600000	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
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	8230400000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	5750000000.0	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	3263300000	USD
CY2020	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	7925100000	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
CY2020	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1940000000.0	USD
CY2019	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1300000000.0	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	68500000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	20500000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1215300000	USD
CY2018	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1500000000.0	USD
CY2020	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	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
CY2020	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	13875400000	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
CY2020	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	12300000	USD
CY2019	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	11800000	USD
CY2018	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	14400000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	56000000.0	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
CY2020	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	98100000	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
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1928200000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1603000000.0	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1323500000	USD
CY2020	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	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
CY2020	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	68200000	USD
CY2019	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	21000000.0	USD
CY2018	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	3300000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-176500000	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
CY2020	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	861700000	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
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
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-28700000	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
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	283400000	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
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
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1861400000	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
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	6	segment
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Significant Accounting Policies and Use of Estimates</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">—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>
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-bottom:8pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Accounts Receivable and Deferred Rent Asset</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">—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 55% of its current-year revenues are derived from three tenants. </span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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="margin-bottom:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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.
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
CY2020	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	105600000	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
CY2020	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	21300000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	223400000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	6400000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	247600000	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
CY2020	amt	Foreigncurrencytransactiongainlossreclassifiedas Aoci ForeigncurrencytransactiongainlossreclassifiedasAOCI	-391000000.0	USD
CY2019	amt	Foreigncurrencytransactiongainlossreclassifiedas Aoci ForeigncurrencytransactiongainlossreclassifiedasAOCI	-45800000	USD
CY2018	amt	Foreigncurrencytransactiongainlossreclassifiedas Aoci ForeigncurrencytransactiongainlossreclassifiedasAOCI	-385800000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-216400000	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
CY2020	amt	Foreigncurrencytransactiongainlossin Aoc Iand Income Statement ForeigncurrencytransactiongainlossinAOCIandIncomeStatement	-607400000	USD
CY2019	amt	Foreigncurrencytransactiongainlossin Aoc Iand Income Statement ForeigncurrencytransactiongainlossinAOCIandIncomeStatement	-39700000	USD
CY2018	amt	Foreigncurrencytransactiongainlossin Aoc Iand Income Statement ForeigncurrencytransactiongainlossinAOCIandIncomeStatement	-390300000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1746300000	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
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	115100000	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
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1861400000	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
CY2020	amt	Labor Costs Capitalized LaborCostsCapitalized	51100000	USD
CY2019	amt	Labor Costs Capitalized LaborCostsCapitalized	48300000	USD
CY2018	amt	Labor Costs Capitalized LaborCostsCapitalized	55000000.0	USD
CY2019	us-gaap	Revenues Revenues	7580300000	USD
CY2020	amt	Straight Line Revenue StraightLineRevenue	322000000.0	USD
CY2019	amt	Straight Line Revenue StraightLineRevenue	183500000	USD
CY2018	amt	Straight Line Revenue StraightLineRevenue	87600000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	495700000	USD
CY2020	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	7545800000	USD
CY2020	us-gaap	Revenues Revenues	8041500000	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
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	142300000	USD
CY2020	amt	Straight Line Ground Rent Expense StraightLineGroundRentExpense	51600000	USD
CY2019	amt	Straight Line Ground Rent Expense StraightLineGroundRentExpense	44400000	USD
CY2018	amt	Straight Line Ground Rent Expense StraightLineGroundRentExpense	57900000	USD
CY2020	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	2400000	shares
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	1
CY2018	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	1
CY2020	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
CY2020	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.05
CY2018	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.05
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	13200000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11800000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11200000	USD
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	66100000	USD
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	56800000	USD
CY2020Q4	us-gaap	Prepaid Taxes PrepaidTaxes	143700000	USD
CY2019Q4	us-gaap	Prepaid Taxes PrepaidTaxes	185800000	USD
CY2020Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	176900000	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	142300000	USD
CY2020Q4	us-gaap	Value Added Tax Receivable ValueAddedTaxReceivable	66300000	USD
CY2019Q4	us-gaap	Value Added Tax Receivable ValueAddedTaxReceivable	71300000	USD
CY2020Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	79600000	USD
CY2019Q4	us-gaap	Other Assets Miscellaneous Current OtherAssetsMiscellaneousCurrent	57400000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	532600000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	513600000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	30700000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	20672400000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	19325600000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	7863700000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	7241200000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	12808700000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	12084400000	USD
CY2020	us-gaap	Depreciation Depreciation	924300000	USD
CY2019	us-gaap	Depreciation Depreciation	905500000	USD
CY2018	us-gaap	Depreciation Depreciation	883100000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	153000000.0	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	168100000	USD
CY2020Q4	amt	Numberof Tenants NumberofTenants	1	tenant
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	6194600000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	5905500000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	5779500000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	5618800000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	5410600000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	29660900000	USD
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	58569900000	USD
CY2020	amt	Lessee Operating Lease Number Of Renewal Options LesseeOperatingLeaseNumberOfRenewalOptions	1	renewalOption
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	7789200000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	7357400000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	539900000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	494500000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	6884400000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	6510400000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	7424300000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	7004900000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4900000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	23000000.0	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	24000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	27900000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P13Y8M12D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P13Y1M6D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.056
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.061
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P12Y1M6D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P15Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.068
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.062
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	977200000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	1013100000	USD
CY2020	us-gaap	Variable Lease Payment VariableLeasePayment	280000000.0	USD
CY2019	us-gaap	Variable Lease Payment VariableLeasePayment	261700000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1300000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1700000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	988300000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	1012200000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1300000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1700000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	9200000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	18000000.0	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	346000000.0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	409500000	USD
CY2020	amt	Non Cash Operating And Financing Lease Modifications NonCashOperatingAndFinancingLeaseModifications	843100000	USD
CY2019	amt	Non Cash Operating And Financing Lease Modifications NonCashOperatingAndFinancingLeaseModifications	334100000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	901100000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	6200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	869000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	5300000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	836400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	3600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	798000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	2900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	751800000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	2100000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	6423400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	26900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	10579700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	47000000.0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	3155400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	19100000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	7424300000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	27900000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	539900000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4900000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	6884400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	23000000.0	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
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	1200600000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-96200000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	7282700000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	20204300000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	6364500000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	13839800000	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
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	867200000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	791300000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1144100000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	999600000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	994000000.0	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	969000000.0	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	959100000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	927600000	USD
CY2020Q4	us-gaap	Long Term Accounts Notes And Loans Receivable Net Noncurrent LongTermAccountsNotesAndLoansReceivableNetNoncurrent	6500000	USD
CY2019Q4	us-gaap	Long Term Accounts Notes And Loans Receivable Net Noncurrent LongTermAccountsNotesAndLoansReceivableNetNoncurrent	1100000	USD
CY2020Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	393600000	USD
CY2019Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	405300000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	400100000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	406400000	USD
CY2020	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	15500000	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	26900000	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	14100000	USD
CY2020	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	23100000	USD
CY2019	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	9800000	USD
CY2018	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	16100000	USD
CY2020	us-gaap	Proceeds From Previous Acquisition ProceedsFromPreviousAcquisition	4400000	USD
CY2019	us-gaap	Proceeds From Previous Acquisition ProceedsFromPreviousAcquisition	13100000	USD
CY2020	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	14900000	USD
CY2020	amt	Business Combination Pro Forma Information Gross Margin Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationGrossMarginOfAcquireeSinceAcquisitionDateActual	10500000	USD
CY2020	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	8230900000	USD
CY2019	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	8083800000	USD
CY2020	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	1515700000	USD
CY2019	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	1651000000.0	USD
CY2020	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	3.42
CY2019	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	3.73
CY2020	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	3.40
CY2019	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	3.71
CY2020Q4	us-gaap	Construction Payable Current ConstructionPayableCurrent	46500000	USD
CY2019Q4	us-gaap	Construction Payable Current ConstructionPayableCurrent	27800000	USD
CY2020Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	20600000	USD
CY2019Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	55200000	USD
CY2020Q4	amt	Accrued Pass Through Costs AccruedPassThroughCosts	67100000	USD
CY2019Q4	amt	Accrued Pass Through Costs AccruedPassThroughCosts	74200000	USD
CY2020Q4	amt	Acquisitions Payable AcquisitionsPayable	58900000	USD
CY2019Q4	amt	Acquisitions Payable AcquisitionsPayable	0	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1000000.0	USD
CY2020Q4	srt	Payables To Customers PayablesToCustomers	66400000	USD
CY2019Q4	srt	Payables To Customers PayablesToCustomers	77900000	USD
CY2020Q4	amt	Accrued Property And Real Estate Taxes AccruedPropertyAndRealEstateTaxes	219100000	USD
CY2019Q4	amt	Accrued Property And Real Estate Taxes AccruedPropertyAndRealEstateTaxes	198100000	USD
CY2020Q4	us-gaap	Accrued Rent Current AccruedRentCurrent	82600000	USD
CY2019Q4	us-gaap	Accrued Rent Current AccruedRentCurrent	75600000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	104400000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	102400000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	378100000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	347000000.0	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1043700000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	958200000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	27900000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	30700000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	29287500000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	24055400000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	789800000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	2928200000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	28497700000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	21127200000	USD
CY2020	amt	Numberof Annual Renewal Periods NumberofAnnualRenewalPeriods	2	renewalPeriod
CY2020Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-37200000	USD
CY2020Q3	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	34700000	USD
CY2020Q3	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1092100000	USD
CY2020Q4	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1678900000	USD
CY2018Q1	amt	Number Of Trust Sites Assets NumberOfTrustSitesAssets	5114	site
CY2018Q1	amt	Debt Instrument Payment Terms Repayment Period DebtInstrumentPaymentTermsRepaymentPeriod	P12M
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	1900000	USD
CY2020	amt	Business Combination Contingent Consideration Liability Installment Payment Period BusinessCombinationContingentConsiderationLiabilityInstallmentPaymentPeriod	P3Y
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	27900000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	30700000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	789800000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1304600000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	3318900000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	2151900000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	7566000000.0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	14331500000	USD
CY2020Q4	amt	Long Term Debt Total Cash Obligations LongTermDebtTotalCashObligations	29462700000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	175200000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	29287500000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	576100000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	525900000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	408500000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	411100000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	984600000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	937000000.0	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1384100000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1210000000.0	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	94200000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	61800000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	90800000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	81600000	USD
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	8300000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	56800000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	6100000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	26100000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1571300000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1384100000	USD
CY2020	us-gaap	Asset Retirement Obligation Foreign Currency Translation Gain Loss AssetRetirementObligationForeignCurrencyTranslationGainLoss	42100000	USD
CY2019	us-gaap	Asset Retirement Obligation Foreign Currency Translation Gain Loss AssetRetirementObligationForeignCurrencyTranslationGainLoss	6700000	USD
CY2020Q4	amt	Estimated Undiscounted Future Cash Outlay For Asset Retirement Obligations EstimatedUndiscountedFutureCashOutlayForAssetRetirementObligations	3700000000	USD
CY2015Q3	us-gaap	Embedded Derivative Fair Value Of Embedded Derivative Asset EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset	14600000	USD
CY2020Q4	amt	Assets Heldand Used Long Lived Fair Value Disclosure AssetsHeldandUsedLongLivedFairValueDisclosure	24100000000	USD
CY2020	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	222800000	USD
CY2019Q4	amt	Assets Heldand Used Long Lived Fair Value Disclosure AssetsHeldandUsedLongLivedFairValueDisclosure	22400000000	USD
CY2019	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	94200000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	29300000000	USD
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	31400000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	24100000000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-8700000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1700000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1400000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	10700000	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
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	150100000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	48200000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	189700000	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
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1000000.0	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
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-24500000	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
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	129600000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-200000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-110100000	USD
CY2019	us-gaap	Other Tax Expense Benefit OtherTaxExpenseBenefit	-113000000.0	USD
CY2018	us-gaap	Other Tax Expense Benefit OtherTaxExpenseBenefit	-85700000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
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
CY2020	amt	Tax Adjustment Related To Reit TaxAdjustmentRelatedToReit	0.21
CY2019	amt	Tax Adjustment Related To Reit TaxAdjustmentRelatedToReit	0.21
CY2018	amt	Tax Adjustment Related To Reit TaxAdjustmentRelatedToReit	0.21
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.04
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.03
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.08
CY2020	amt	Foreign Withholding Taxes ForeignWithholdingTaxes	0.03
CY2019	amt	Foreign Withholding Taxes ForeignWithholdingTaxes	0.03
CY2018	amt	Foreign Withholding Taxes ForeignWithholdingTaxes	0.04
CY2020	amt	Effective Income Tax Rate Reconciliation Tax Reserves EffectiveIncomeTaxRateReconciliationTaxReserves	0.01
CY2019	amt	Effective Income Tax Rate Reconciliation Tax Reserves EffectiveIncomeTaxRateReconciliationTaxReserves	0.01
CY2018	amt	Effective Income Tax Rate Reconciliation Tax Reserves EffectiveIncomeTaxRateReconciliationTaxReserves	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.06
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2020	amt	Effective Income Tax Rate Reconciliation Mipt EffectiveIncomeTaxRateReconciliationMIPT	0
CY2019	amt	Effective Income Tax Rate Reconciliation Mipt EffectiveIncomeTaxRateReconciliationMIPT	-0.01
CY2018	amt	Effective Income Tax Rate Reconciliation Mipt EffectiveIncomeTaxRateReconciliationMIPT	-0.06
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.01
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.07
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.10
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1683000000.0	USD
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
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	138100000	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
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1821100000	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
CY2020Q4	amt	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	837100000	USD
CY2019Q4	amt	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	878500000	USD
CY2020Q4	amt	Net Long Term Operating Loss Carry Forwards NetLongTermOperatingLossCarryForwards	327100000	USD
CY2019Q4	amt	Net Long Term Operating Loss Carry Forwards NetLongTermOperatingLossCarryForwards	356600000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	187800000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	174900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	9200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5600000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	34600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	31700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	4900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	3800000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	83400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	65600000	USD
CY2020Q4	amt	Deferred Tax Asset Nondeductible Expense Interest Amount DeferredTaxAssetNondeductibleExpenseInterestAmount	60900000	USD
CY2019Q4	amt	Deferred Tax Asset Nondeductible Expense Interest Amount DeferredTaxAssetNondeductibleExpenseInterestAmount	15900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	65800000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	10200000	USD
CY2020Q4	amt	Deferred Tax Liability Depreciation And Amortization DeferredTaxLiabilityDepreciationAndAmortization	1140300000	USD
CY2019Q4	amt	Deferred Tax Liability Depreciation And Amortization DeferredTaxLiabilityDepreciationAndAmortization	1040300000	USD
CY2020Q4	amt	Deferred Tax Liabilities Rightof Use Asset DeferredTaxLiabilitiesRightofUseAsset	824000000.0	USD
CY2019Q4	amt	Deferred Tax Liabilities Rightof Use Asset DeferredTaxLiabilitiesRightofUseAsset	865100000	USD
CY2020Q4	amt	Deferred Tax Deferred Rent Noncurrent DeferredTaxDeferredRentNoncurrent	92900000	USD
CY2019Q4	amt	Deferred Tax Deferred Rent Noncurrent DeferredTaxDeferredRentNoncurrent	79700000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	60400000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1100000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	USD
CY2020Q4	amt	Deferred Tax Liabilities Assets Gross DeferredTaxLiabilitiesAssetsGross	507900000	USD
CY2019Q4	amt	Deferred Tax Liabilities Assets Gross DeferredTaxLiabilitiesAssetsGross	442300000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	228500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	194200000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	736400000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	636500000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	228500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	194200000	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
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	158100000	USD
CY2020	amt	Valuation Allowance Deferred Tax Asset Increase ValuationAllowanceDeferredTaxAssetIncrease	64700000	USD
CY2019	amt	Valuation Allowance Deferred Tax Asset Increase ValuationAllowanceDeferredTaxAssetIncrease	42500000	USD
CY2018	amt	Valuation Allowance Deferred Tax Asset Increase ValuationAllowanceDeferredTaxAssetIncrease	15700000	USD
CY2020	amt	Valuation Allowance Deferred Tax Asset Decrease ValuationAllowanceDeferredTaxAssetDecrease	22000000.0	USD
CY2019	amt	Valuation Allowance Deferred Tax Asset Decrease ValuationAllowanceDeferredTaxAssetDecrease	0	USD
CY2018	amt	Valuation Allowance Deferred Tax Asset Decrease ValuationAllowanceDeferredTaxAssetDecrease	0	USD
CY2020	amt	Valuation Allowance Deferred Tax Asset Increase Decreaserelatedtoforeigncurrency ValuationAllowanceDeferredTaxAssetIncreaseDecreaserelatedtoforeigncurrency	-8400000	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
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	228500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	194200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	151900000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	105900000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	26200000	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
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4700000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	33300000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	8100000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	5000000.0	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
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation	9600000	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
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	26000000.0	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
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	3500000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	6700000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	136200000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	175600000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	107700000	USD
CY2020	amt	Unrecognized Tax Benefits Reduction Resultingfrom Lapseof Applicable Statueof Limitationsand Effective Settlements UnrecognizedTaxBenefitsReductionResultingfromLapseofApplicableStatueofLimitationsandEffectiveSettlements	50500000	USD
CY2019	amt	Unrecognized Tax Benefits Reduction Resultingfrom Lapseof Applicable Statueof Limitationsand Effective Settlements UnrecognizedTaxBenefitsReductionResultingfromLapseofApplicableStatueofLimitationsandEffectiveSettlements	2500000	USD
CY2018	amt	Unrecognized Tax Benefits Reduction Resultingfrom Lapseof Applicable Statueof Limitationsand Effective Settlements UnrecognizedTaxBenefitsReductionResultingfromLapseofApplicableStatueofLimitationsandEffectiveSettlements	9300000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	16400000	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
CY2020	amt	Unrecognized Tax Benefits Decrease In Income Tax Penalties And Interest Expense Resulting From Expiration Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsDecreaseInIncomeTaxPenaltiesAndInterestExpenseResultingFromExpirationOfApplicableStatuteOfLimitations	4800000	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
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	34400000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	26600000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Discount From Market Price Purchase Date ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate	0.15
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	120800000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	111400000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	137500000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1700000	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
CY2020	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2019	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	525700000	USD
CY2018	us-gaap	Temporary Equity Foreign Currency Translation Adjustments TemporaryEquityForeignCurrencyTranslationAdjustments	92100000	USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	212100000	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
CY2018	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	0	USD
CY2020	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-6600000	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
CY2020	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-14000000.0	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
CY2020	amt	Noncontrollinginterestdecreaseduetomerger Noncontrollinginterestdecreaseduetomerger	0	USD
CY2019	amt	Noncontrollinginterestdecreaseduetomerger Noncontrollinginterestdecreaseduetomerger	0	USD
CY2018	amt	Noncontrollinginterestdecreaseduetomerger Noncontrollinginterestdecreaseduetomerger	-28100000	USD
CY2020	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	861700000	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
CY2020	us-gaap	Temporary Equity Foreign Currency Translation Adjustments TemporaryEquityForeignCurrencyTranslationAdjustments	15300000	USD
CY2019	us-gaap	Temporary Equity Foreign Currency Translation Adjustments TemporaryEquityForeignCurrencyTranslationAdjustments	8300000	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
CY2020	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	98100000	USD
CY2020Q3	amt	Sale Of Stock Authorized Amount To Be Sold SaleOfStockAuthorizedAmountToBeSold	1000000000.0	USD
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	56000000.0	USD
CY2020Q4	amt	Accrued Dividend Rsu AccruedDividendRsu	12600000	USD
CY2019Q4	amt	Accrued Dividend Rsu AccruedDividendRsu	14300000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	222800000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	94200000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	394000000.0	USD
CY2020	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-17300000	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
CY2020	amt	Other Operating Expenses OtherOperatingExpenses	25700000	USD
CY2019	amt	Other Operating Expenses OtherOperatingExpenses	27000000.0	USD
CY2018	amt	Other Operating Expenses OtherOperatingExpenses	33700000	USD
CY2020	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	265800000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	166300000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	513300000	USD
CY2019	us-gaap	Proceeds From Previous Acquisition ProceedsFromPreviousAcquisition	13100000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	222800000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	94200000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	394000000.0	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1690600000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1887800000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1236400000	USD
CY2020	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	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
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1690600000	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
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	443640000	shares
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
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	2464000	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
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	446104000	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
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.81
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.27
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.79
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.79
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.24
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.77
CY2016Q4	amt	Loss Contingency Foreign Income Tax Assessment LossContingencyForeignIncomeTaxAssessment	4750000000	INR
CY2016Q4	amt	Loss Contingency Foreign Income Tax Assessment LossContingencyForeignIncomeTaxAssessment	69800000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	762300000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	750200000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	789700000	USD
CY2020	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	27000000.0	USD
CY2019	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	11200000	USD
CY2018	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	25000000.0	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	146300000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	147500000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	163900000	USD
CY2020	amt	Capital Expenditures Incurred But Not Yet Paid Increase Decrease CapitalExpendituresIncurredButNotYetPaidIncreaseDecrease	-45800000	USD
CY2019	amt	Capital Expenditures Incurred But Not Yet Paid Increase Decrease CapitalExpendituresIncurredButNotYetPaidIncreaseDecrease	21000000.0	USD
CY2018	amt	Capital Expenditures Incurred But Not Yet Paid Increase Decrease CapitalExpendituresIncurredButNotYetPaidIncreaseDecrease	-8300000	USD
CY2020	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	75000000.0	USD
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	81300000	USD
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	57800000	USD
CY2020	amt	Fair Value Of Debt Assumed Through Acquisitions FairValueOfDebtAssumedThroughAcquisitions	800000000.0	USD
CY2019	amt	Fair Value Of Debt Assumed Through Acquisitions FairValueOfDebtAssumedThroughAcquisitions	329800000	USD
CY2018	amt	Fair Value Of Debt Assumed Through Acquisitions FairValueOfDebtAssumedThroughAcquisitions	0	USD
CY2020	amt	Settlement Of Accounts Receivable Due To Acquisition SettlementOfAccountsReceivableDueToAcquisition	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
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	54200000	USD
CY2020	us-gaap	Notes Reduction NotesReduction	5000000.0	USD
CY2019	us-gaap	Notes Reduction NotesReduction	0	USD
CY2018	us-gaap	Notes Reduction NotesReduction	0	USD
CY2020Q4	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	6	segment
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	120800000	USD
CY2020	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	176000000.0	USD
CY2020	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	1882300000	USD
CY2020	us-gaap	Other Expenses OtherExpenses	1332200000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1821100000	USD
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1071200000	USD
CY2020	amt	Finance Lease Payments Financing Activities FinanceLeasePaymentsFinancingActivities	9200000	USD
CY2020	amt	Payments For Perpetual Land Easements PaymentsForPerpetualLandEasements	36900000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	111400000	USD
CY2019	us-gaap	Other Selling General And Administrative Expense OtherSellingGeneralAndAdministrativeExpense	156500000	USD
CY2020	us-gaap	Real Estate Improvements RealEstateImprovements	91400000	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
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	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	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1154600000	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
CY2020Q4	us-gaap	Assets Assets	47233500000	USD
CY2019Q4	us-gaap	Assets Assets	42801600000	USD
CY2018Q4	us-gaap	Assets Assets	33010400000	USD
CY2020	us-gaap	Revenues Revenues	8041500000	USD
CY2019	us-gaap	Revenues Revenues	7580300000	USD
CY2018	us-gaap	Revenues Revenues	7440100000	USD
CY2020Q4	us-gaap	Noncurrent Assets NoncurrentAssets	33931200000	USD
CY2019Q4	us-gaap	Noncurrent Assets NoncurrentAssets	30581100000	USD
CY2020	srt	Sec Schedule Iii Real Estate Number Of Units SECScheduleIIIRealEstateNumberOfUnits	183860	communicationSite
CY2020Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	3136700000	USD
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	18492900000	USD
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	6921000000.0	USD
CY2019Q4	amt	Percentage Of Gross Amounts Maximum PercentageOfGrossAmountsMaximum	0.05
CY2019Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	3100000000	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
CY2020	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	722400000	USD
CY2019	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	887000000.0	USD
CY2018	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	721400000	USD
CY2020	amt	Discretionary Capital Projects DiscretionaryCapitalProjects	308000000.0	USD
CY2019	amt	Discretionary Capital Projects DiscretionaryCapitalProjects	258100000	USD
CY2018	amt	Discretionary Capital Projects DiscretionaryCapitalProjects	173500000	USD
CY2020	amt	Discretionary Ground Lease Purchases DiscretionaryGroundLeasePurchases	214300000	USD
CY2019	amt	Discretionary Ground Lease Purchases DiscretionaryGroundLeasePurchases	189800000	USD
CY2018	amt	Discretionary Ground Lease Purchases DiscretionaryGroundLeasePurchases	180400000	USD
CY2020	amt	Redevelopment Capital Expenditures RedevelopmentCapitalExpenditures	176700000	USD
CY2019	amt	Redevelopment Capital Expenditures RedevelopmentCapitalExpenditures	213600000	USD
CY2018	amt	Redevelopment Capital Expenditures RedevelopmentCapitalExpenditures	177300000	USD
CY2019	us-gaap	Real Estate Improvements RealEstateImprovements	161200000	USD
CY2018	us-gaap	Real Estate Improvements RealEstateImprovements	94000000.0	USD
CY2020	amt	Start Up Capital Expenditures StartUpCapitalExpenditures	119400000	USD
CY2019	amt	Start Up Capital Expenditures StartUpCapitalExpenditures	71300000	USD
CY2018	amt	Start Up Capital Expenditures StartUpCapitalExpenditures	113100000	USD
CY2020	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	72800000	USD
CY2019	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	45200000	USD
CY2018	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	-3000000.0	USD
CY2020	amt	Real Estate Period Additions To Cost RealEstatePeriodAdditionsToCost	1705000000.0	USD
CY2019	amt	Real Estate Period Additions To Cost RealEstatePeriodAdditionsToCost	1826200000	USD
CY2018	amt	Real Estate Period Additions To Cost RealEstatePeriodAdditionsToCost	1456700000	USD
CY2020	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	259700000	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
CY2020	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	381700000	USD
CY2019	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	52400000	USD
CY2018	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	449900000	USD
CY2020	amt	Real Estate Period Deductions To Cost RealEstatePeriodDeductionsToCost	641400000	USD
CY2019	amt	Real Estate Period Deductions To Cost RealEstatePeriodDeductionsToCost	357000000.0	USD
CY2018	amt	Real Estate Period Deductions To Cost RealEstatePeriodDeductionsToCost	845600000	USD
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	18492900000	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
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
CY2020	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	771500000	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
CY2020	us-gaap	Real Estate Accumulated Depreciation Other Additions RealEstateAccumulatedDepreciationOtherAdditions	0	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
CY2020	amt	Real Estate Period Additions To Accumulated Depreciation RealEstatePeriodAdditionsToAccumulatedDepreciation	771500000	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
CY2020	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	132300000	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
CY2020	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	100400000	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
CY2020	amt	Real Estate Period Deductions To Accumulated Depreciation RealEstatePeriodDeductionsToAccumulatedDepreciation	232700000	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
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	6921000000.0	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	6382200000	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	5724700000	USD

Files In Submission

Name	View Source	Status
0001053507-21-000026-index-headers.html	Edgar Link	pending
0001053507-21-000026-index.html	Edgar Link	pending
0001053507-21-000026.txt	Edgar Link	pending
0001053507-21-000026-xbrl.zip	Edgar Link	pending
amt-20201231.htm	Edgar Link	pending
amt-20201231.xsd	Edgar Link	pending
amt-20201231_cal.xml	Edgar Link	unprocessable
amt-20201231_def.xml	Edgar Link	unprocessable
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amt-20201231_htm.xml	Edgar Link	completed
amt-20201231_lab.xml	Edgar Link	unprocessable
amt-20201231_pre.xml	Edgar Link	unprocessable
exhibit1028fy2020.htm	Edgar Link	pending
exhibit1029.htm	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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$AMT
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2020 Form 10-K Financial Statement

#000105350721000026 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMT AMERICAN TOWER CORP /MA/ Stock $amt

2020 Form 10-K Financial Statement

#000105350721000026 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMT
AMERICAN TOWER CORP /MA/ Stock $amt