$LH
LABCORP HOLDINGS INC. Stock $lh

$lh Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000092014821000018 Filed on February 25, 2021

Income Statement

Concept	2020 Q4	2020	2019 Q4
Revenue	$4.490B	$13.98B	$2.953B
YoY Change	52.02%	20.98%	5.95%
Cost Of Revenue	$2.585B	$9.026B	$2.133B
YoY Change	21.2%	8.71%	5.84%
Gross Profit	$1.905B	$4.953B	$820.7M
YoY Change	132.11%	52.28%	6.25%
Gross Profit Margin	42.43%	35.43%	27.79%
Selling, General & Admin	$498.2M	$1.729B	$380.5M
YoY Change	30.93%	6.45%	-4.13%
% of Gross Profit	26.15%	34.92%	46.36%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$183.9M	$624.7M	$155.8M
YoY Change	18.04%	8.23%	13.14%
% of Gross Profit	9.65%	12.61%	18.98%
Operating Expenses	$589.0M	$1.729B	$444.7M
YoY Change	32.45%	6.45%	-1.85%
Operating Profit	$1.316B	$2.445B	$336.4M
YoY Change	291.17%	83.84%	9.33%
Interest Expense	-$49.20M	$207.4M	-$49.70M
YoY Change	-1.01%	-13.83%	-4.05%
% of Operating Profit	-3.74%	8.48%	-14.77%
Other Income/Expense, Net	-$1.300M	-$226.3M	-$4.800M
YoY Change	-72.92%	0.44%	-88.41%
Pretax Income	$1.243B	$1.847B	$292.9M
YoY Change	324.27%	135.4%	36.55%
Income Tax	$304.1M	$662.1M	$65.60M
% Of Pretax Income	24.47%	35.86%	22.4%
Net Earnings	$938.3M	$1.556B	$227.1M
YoY Change	313.17%	88.89%	43.83%
Net Earnings / Revenue	20.9%	11.13%	7.69%
Basic Earnings Per Share		$15.99	$2.34
Diluted Earnings Per Share	$9.545M	$15.88	$2.32
COMMON SHARES
Basic Shares Outstanding	97.40M shares	97.30M shares	97.10M shares
Diluted Shares Outstanding		98.00M shares

Balance Sheet

Concept	2020 Q4	2020	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.321B	$1.321B	$338.0M
YoY Change	290.83%	290.83%	-20.84%
Cash & Equivalents	$1.321B	$1.321B	$337.5M
Short-Term Investments
Other Short-Term Assets	$365.0M	$365.0M	$374.0M
YoY Change	-2.41%	-2.41%	21.04%
Inventory	$423.2M	$423.0M	$244.7M
Prepaid Expenses	$364.8M		$373.7M
Receivables	$2.480B	$3.017B	$1.544B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$5.125B	$5.125B	$2.981B
YoY Change	71.92%	71.92%	5.14%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.730B	$2.809B	$2.637B
YoY Change	3.53%	3.12%	51.5%
Goodwill	$7.752B		$7.865B
YoY Change	-1.44%		6.86%
Intangibles	$3.961B		$4.035B
YoY Change	-1.82%		3.16%
Long-Term Investments	$74.00M	$74.00M	$85.00M
YoY Change	-12.94%	-12.94%	39.34%
Other Assets	$410.0M	$351.0M	$435.4M
YoY Change	-5.83%	-1.68%	57.75%
Total Long-Term Assets	$14.95B	$14.95B	$15.07B
YoY Change	-0.79%	-0.78%	12.85%
TOTAL ASSETS
Total Short-Term Assets	$5.125B	$5.125B	$2.981B
Total Long-Term Assets	$14.95B	$14.95B	$15.07B
Total Assets	$20.07B	$20.07B	$18.05B
YoY Change	11.22%	11.23%	11.5%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$638.9M	$639.0M	$632.3M
YoY Change	1.04%	1.11%	-0.36%
Accrued Expenses	$1.358B	$1.175B	$942.4M
YoY Change	44.07%	18.45%	8.32%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change			-100.0%
Long-Term Debt Due	$383.0M	$383.0M	$424.0M
YoY Change	-9.67%	-9.67%	4140.0%
Total Short-Term Liabilities	$3.079B	$3.079B	$2.656B
YoY Change	15.92%	15.93%	41.35%
LONG-TERM LIABILITIES
Long-Term Debt	$5.419B	$5.503B	$5.790B
YoY Change	-6.4%	-6.43%	-3.36%
Other Long-Term Liabilities	$526.4M	$1.204B	$383.2M
YoY Change	37.37%	22.86%	14.73%
Total Long-Term Liabilities	$5.945B	$6.707B	$6.173B
YoY Change	-3.69%	-2.24%	-2.4%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.079B	$3.079B	$2.656B
Total Long-Term Liabilities	$5.945B	$6.707B	$6.173B
Total Liabilities	$10.61B	$10.71B	$10.46B
YoY Change	1.48%	2.22%	13.75%
SHAREHOLDERS EQUITY
Retained Earnings	$9.479B		$7.904B
YoY Change	19.94%		10.44%
Common Stock	$119.3M		$35.80M
YoY Change	233.24%		-97.55%
Preferred Stock
YoY Change
Treasury Stock (at cost)			$0.00
YoY Change			-100.0%
Treasury Stock Shares	0.000 shares		0.000 shares
Shareholders Equity	$9.360B	$9.360B	$7.644B
YoY Change
Total Liabilities & Shareholders Equity	$20.07B	$20.07B	$18.05B
YoY Change	11.22%	11.23%	11.5%

Cashflow Statement

Concept	2020 Q4	2020	2019 Q4
OPERATING ACTIVITIES
Net Income	$938.3M	$1.556B	$227.1M
YoY Change	313.17%	88.89%	43.83%
Depreciation, Depletion And Amortization	$183.9M	$624.7M	$155.8M
YoY Change	18.04%	8.23%	13.14%
Cash From Operating Activities	$774.6M	$2.135B	$569.8M
YoY Change	35.94%	47.8%	17.15%
INVESTING ACTIVITIES
Capital Expenditures	-$99.40M	$381.7M	-$128.2M
YoY Change	-22.46%	-4.62%	4.91%
Acquisitions		$267.6M
YoY Change		-69.45%
Other Investing Activities	-$28.60M	-$261.5M	-$23.90M
YoY Change	19.67%	-70.38%	-3.24%
Cash From Investing Activities	-$128.0M	-$643.2M	-$152.1M
YoY Change	-15.84%	-49.87%	3.54%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$100.0M
YoY Change		-77.78%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-1.000M	-$517.4M	-449.4M
YoY Change	-99.78%	104.75%	-44.03%
NET CHANGE
Cash From Operating Activities	774.6M	$2.135B	569.8M
Cash From Investing Activities	-128.0M	-$643.2M	-152.1M
Cash From Financing Activities	-1.000M	-$517.4M	-449.4M
Net Change In Cash	645.6M	$983.3M	-31.70M
YoY Change	-2136.59%	-1201.12%	-93.16%
FREE CASH FLOW
Cash From Operating Activities	$774.6M	$2.135B	$569.8M
Capital Expenditures	-$99.40M	$381.7M	-$128.2M
Free Cash Flow	$874.0M	$1.754B	$698.0M
YoY Change	25.21%	67.89%	14.69%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Registrant Name EntityRegistrantName	LABORATORY CORPORATION OF AMERICA HOLDINGS
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000920148
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	97600000	shares
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020	lh	Icfr Attestation Flag ICFRAttestationFlag	true
CY2020Q2	dei	Entity Public Float EntityPublicFloat	15200000000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	22100000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	19000000.0	USD
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	97500000	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	97200000	shares
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-11353
CY2020	dei	Entity Registrant Name EntityRegistrantName	LABORATORY CORPORATION OF AMERICA HOLDINGS
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-3757370
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	358 South Main Street
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Burlington,
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	NC
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	27215
CY2020	dei	City Area Code CityAreaCode	336
CY2020	dei	Local Phone Number LocalPhoneNumber	229-1127
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.10 par value
CY2020	dei	Trading Symbol TradingSymbol	LH
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	97600000	shares
CY2020	lh	Icfr Attestation Flag ICFRAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	15200000000	USD
CY2020	us-gaap	Revenues Revenues	13978500000	USD
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	15.88
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2135300000	USD
CY2020	us-gaap	Revenues Revenues	13978500000	USD
CY2020	us-gaap	Gross Profit GrossProfit	4952800000	USD
CY2019	us-gaap	Gross Profit GrossProfit	3252500000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	2445400000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	1330200000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1556100000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	823800000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2135300000	USD
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CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	15.99
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CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	15.88
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.35
CY2020	lh	Percentof Revenue Contributed PercentofRevenueContributed	1
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CY2018	lh	Percentof Revenue Contributed PercentofRevenueContributed	1
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CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	2479800000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1543900000	USD
CY2020Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	536800000	USD
CY2019Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	481400000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	423200000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	244700000	USD
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	364800000	USD
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	373700000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	5125400000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	2981200000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2729600000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2636600000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	7751500000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	7865000000.0	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	3961100000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	4034500000	USD
CY2020Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	73500000	USD
CY2019Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	84900000	USD
CY2020Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	20600000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	8800000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	410000000.0	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	435400000	USD
CY2020Q4	us-gaap	Assets Assets	20071700000	USD
CY2019Q4	us-gaap	Assets Assets	18046400000	USD
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CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	632300000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1357700000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	942400000	USD
CY2020Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	506500000	USD
CY2019Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	451000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	8400000	USD
CY2020Q4	us-gaap	Debt Current DebtCurrent	376700000	USD
CY2019Q4	us-gaap	Debt Current DebtCurrent	415200000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3078500000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2655800000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5419000000.0	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5789800000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	84400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	91100000	USD
CY2020Q4	lh	Deferred Income Taxes And Other Tax Liabilities DeferredIncomeTaxesAndOtherTaxLiabilities	905400000	USD
CY2019Q4	lh	Deferred Income Taxes And Other Tax Liabilities DeferredIncomeTaxesAndOtherTaxLiabilities	942800000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	526400000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	383200000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	10691300000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	10459300000	USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	lh	Noncontrolling Interest Mezzanine Equity NoncontrollingInterestMezzanineEquity	20700000	USD
CY2019Q4	lh	Noncontrolling Interest Mezzanine Equity NoncontrollingInterestMezzanineEquity	20100000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	9000000.0	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	9000000.0	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	110300000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	26800000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	9402300000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	7903600000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-161900000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-372400000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	9359700000	USD
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CY2020	us-gaap	Revenues Revenues	13978500000	USD
CY2019	us-gaap	Revenues Revenues	11554800000	USD
CY2018	us-gaap	Revenues Revenues	11333400000	USD
CY2020	us-gaap	Cost Of Revenue CostOfRevenue	9025700000	USD
CY2019	us-gaap	Cost Of Revenue CostOfRevenue	8302300000	USD
CY2018	us-gaap	Cost Of Revenue CostOfRevenue	8157000000.0	USD
CY2020	us-gaap	Gross Profit GrossProfit	4952800000	USD
CY2019	us-gaap	Gross Profit GrossProfit	3252500000	USD
CY2018	us-gaap	Gross Profit GrossProfit	3176400000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1729300000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1624500000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1570900000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	275400000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	243200000	USD
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CY2020	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	462100000	USD
CY2019	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2018	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2020	lh	Net Restructuring And Other Special Charges NetRestructuringAndOtherSpecialCharges	40600000	USD
CY2019	lh	Net Restructuring And Other Special Charges NetRestructuringAndOtherSpecialCharges	54600000	USD
CY2018	lh	Net Restructuring And Other Special Charges NetRestructuringAndOtherSpecialCharges	48100000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	2445400000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	1330200000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1325700000	USD
CY2020	us-gaap	Interest Expense InterestExpense	207400000	USD
CY2019	us-gaap	Interest Expense InterestExpense	240700000	USD
CY2018	us-gaap	Interest Expense InterestExpense	244200000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2900000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	9800000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	11600000	USD
CY2020	us-gaap	Investment Income Net InvestmentIncomeNet	10300000	USD
CY2019	us-gaap	Investment Income Net InvestmentIncomeNet	8800000	USD
CY2018	us-gaap	Investment Income Net InvestmentIncomeNet	7500000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-32100000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3200000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	167700000	USD
CY2020	lh	Income Loss From Continuing Operations Before Income Taxes And Minority Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndMinorityInterest	2219100000	USD
CY2019	lh	Income Loss From Continuing Operations Before Income Taxes And Minority Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndMinorityInterest	1104900000	USD
CY2018	lh	Income Loss From Continuing Operations Before Income Taxes And Minority Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndMinorityInterest	1268300000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	662100000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	280000000.0	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	384400000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	1557000000.0	USD
CY2019	us-gaap	Profit Loss ProfitLoss	824900000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	883900000	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	1100000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	200000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1556100000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	823800000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	883700000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	15.99
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	8.42
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	8.71
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	15.88
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.35
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.61
CY2020	us-gaap	Profit Loss ProfitLoss	1557000000.0	USD
CY2019	us-gaap	Profit Loss ProfitLoss	824900000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	883900000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	264100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	104400000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-176600000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	65700000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	17400000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-29300000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	198400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	87000000.0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-147300000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-12100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-3700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-17900000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	210500000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	90700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-129400000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1767500000	USD
CY2019Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	601400000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	915600000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	754500000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	900000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1100000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	200000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1766600000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	914500000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	754300000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	12000000.0	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1989800000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	6196100000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	1060100000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-333700000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	6804100000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	883700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-129400000	USD
CY2018	lh	Issuance Of Common Stock Under Employee Stock Plans IssuanceOfCommonStockUnderEmployeeStockPlans	69100000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	48000000.0	USD
CY2018	lh	Conversion Of Zero Coupon Convertible Debt ConversionOfZeroCouponConvertibleDebt	300000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	91600000	USD
CY2018	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	700000000.0	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	6971400000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	823800000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	90700000	USD
CY2019	lh	Issuance Of Common Stock Under Employee Stock Plans IssuanceOfCommonStockUnderEmployeeStockPlans	64700000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	40600000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	107000000.0	USD
CY2019	us-gaap	Treasury Stock Retired Cost Method Amount TreasuryStockRetiredCostMethodAmount	0	USD
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	450000000.0	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	7567000000.0	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1556100000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	210500000	USD
CY2020	lh	Issuance Of Common Stock Under Employee Stock Plans IssuanceOfCommonStockUnderEmployeeStockPlans	55900000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	34500000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	111700000	USD
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	100000000.0	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	9359700000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	1557000000.0	USD
CY2019	us-gaap	Profit Loss ProfitLoss	824900000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	883900000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	624700000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	577200000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	552100000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	111700000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	107000000.0	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	91600000	USD
CY2020	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-13200000	USD
CY2018	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-184900000	USD
CY2020	lh	Depreciation And Amortization Of Leased Assets DepreciationAndAmortizationOfLeasedAssets	200300000	USD
CY2019	lh	Depreciation And Amortization Of Leased Assets DepreciationAndAmortizationOfLeasedAssets	194100000	USD
CY2018	lh	Depreciation And Amortization Of Leased Assets DepreciationAndAmortizationOfLeasedAssets	0	USD
CY2020	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	462100000	USD
CY2019	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2018	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	47000000.0	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-29200000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-22200000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	83400000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-6500000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	10800000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	913400000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	64100000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-50200000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	42500000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	59000000.0	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	81000000.0	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	196600000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	21900000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	18900000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	5400000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	42600000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	57900000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-5300000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-12800000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	43300000	USD
CY2020	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	48400000	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	38100000	USD
CY2018	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-33800000	USD
CY2020	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	257900000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-132100000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	27800000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2135300000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1444700000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1305400000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	381700000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	400200000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	379800000	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	40100000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	27500000	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	22300000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	42100000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	7700000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	50100000	USD
CY2020	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	1000000.0	USD
CY2019	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	11200000	USD
CY2018	us-gaap	Proceeds From Sale Of Other Investments ProceedsFromSaleOfOtherInvestments	0	USD
CY2020	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	658200000	USD
CY2020	us-gaap	Proceeds From Derivative Instrument Investing Activities ProceedsFromDerivativeInstrumentInvestingActivities	3100000	USD
CY2019	us-gaap	Proceeds From Derivative Instrument Investing Activities ProceedsFromDerivativeInstrumentInvestingActivities	1700000	USD
CY2018	us-gaap	Proceeds From Derivative Instrument Investing Activities ProceedsFromDerivativeInstrumentInvestingActivities	18300000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	267600000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	876000000.0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	117800000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-643200000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1283100000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	206700000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1050000000.0	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	850000000.0	USD
CY2018	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	0	USD
CY2020	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	0	USD
CY2019	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	1002000000.0	USD
CY2018	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	295000000.0	USD
CY2020	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	151700000	USD
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	495000000.0	USD
CY2018	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	467200000	USD
CY2020	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	151700000	USD
CY2019	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	495000000.0	USD
CY2018	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	467200000	USD
CY2020	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	412200000	USD
CY2019	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	687900000	USD
CY2018	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	400000000.0	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	11600000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2020	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	-34500000	USD
CY2019	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	-40600000	USD
CY2018	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	-48000000.0	USD
CY2020	lh	Net Proceeds From Issuance Of Stock To Employees NetProceedsFromIssuanceOfStockToEmployees	55900000	USD
CY2019	lh	Net Proceeds From Issuance Of Stock To Employees NetProceedsFromIssuanceOfStockToEmployees	64700000	USD
CY2018	lh	Net Proceeds From Issuance Of Stock To Employees NetProceedsFromIssuanceOfStockToEmployees	69100000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	100000000.0	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	450000000.0	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	700000000.0	USD
CY2020	lh	Other Financing Cash Flows OtherFinancingCashFlows	26600000	USD
CY2019	lh	Other Financing Cash Flows OtherFinancingCashFlows	25300000	USD
CY2018	lh	Other Financing Cash Flows OtherFinancingCashFlows	16000000.0	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-517400000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-252700000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1389900000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	8600000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1800000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-12000000.0	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	983300000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-89300000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	110200000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	337500000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	426800000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	316600000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1320800000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	337500000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	426800000	USD
CY2020	lh	Cost Method Investments Maximum Ownership Percentage CostMethodInvestmentsMaximumOwnershipPercentage	0.20
CY2020	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	462100000	USD
CY2020	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	25400000	USD
CY2020Q2	lh	Cares Act Provider Relief Funding CARESActProviderReliefFunding	55900000	USD
CY2020Q3	lh	Cares Act Provider Relief Funding CARESActProviderReliefFunding	76200000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:3pt;margin-top:7pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-bottom:7pt;margin-top:3pt;text-align:justify;text-indent:15.75pt"><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 generally accepted accounting principles requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reported periods. Significant estimates include implicit price concessions, revenue estimates, the allowances for doubtful accounts, deferred tax assets, fair values of acquired assets and assumed liabilities in business combinations, fair value of goodwill and indefinite-lived intangible assets, amortization lives for acquired intangible assets, and accruals for self-insurance reserves, litigation reserves and pensions. The allowance for doubtful accounts is determined based on historical collections trends, the aging of accounts, current economic conditions and regulatory changes. Actual results could differ from those estimates.</span></div><div style="margin-bottom:7pt;margin-top:3pt;text-align:justify;text-indent:13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The extent to which the COVID-19 pandemic has and will continue to impact the Company’s business and financial results depend on numerous evolving factors including, but not limited to: the magnitude and duration of the COVID-19 pandemic, the impact to worldwide macroeconomic conditions including interest rates, employment rates and health insurance coverage, the speed of the anticipated recovery, and governmental and business reactions to the pandemic. The Company assessed certain accounting matters that generally require consideration of forecasted financial information in context with the information reasonably available to the Company and the unknown future impacts of COVID-19 as of December 31, 2020, and through the date of this Annual Report. The accounting matters assessed included, but were not limited to, the Company’s implicit price concessions and credit losses, equity investments, notes receivable and the carrying value of goodwill and other long-lived assets. The Company’s future assessment of the magnitude and duration of COVID-19, as well as other factors, could result in additional material impacts to the Company’s consolidated financial statements in future reporting periods</span></div>
CY2020Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	1319400000	USD
CY2019Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	335000000.0	USD
CY2020Q4	lh	Concentration Risk Accounts Receivable Medicare And Medicaid ConcentrationRiskAccountsReceivableMedicareAndMedicaid	109800000	USD
CY2019Q4	lh	Concentration Risk Accounts Receivable Medicare And Medicaid ConcentrationRiskAccountsReceivableMedicareAndMedicaid	81400000	USD
CY2020Q4	lh	Accountsreceivablefrom Ontariogovernmentsponsoredhealthcareplan AccountsreceivablefromOntariogovernmentsponsoredhealthcareplan	600000	USD
CY2019Q4	lh	Accountsreceivablefrom Ontariogovernmentsponsoredhealthcareplan AccountsreceivablefromOntariogovernmentsponsoredhealthcareplan	3200000	USD
CY2020Q4	lh	Percentofgrossaccountsreceivableduefrompatients Percentofgrossaccountsreceivableduefrompatients	0.139
CY2019Q4	lh	Percentofgrossaccountsreceivableduefrompatients Percentofgrossaccountsreceivableduefrompatients	0.211
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1556100000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	97300000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	15.99
CY2019	us-gaap	Net Income Loss NetIncomeLoss	823800000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	97900000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	8.42
CY2018	us-gaap	Net Income Loss NetIncomeLoss	883700000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	101400000	shares
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	8.71
CY2020	lh	Incremental Common Shares Attributable To Stock Options IncrementalCommonSharesAttributableToStockOptions	700000	shares
CY2019	lh	Incremental Common Shares Attributable To Stock Options IncrementalCommonSharesAttributableToStockOptions	700000	shares
CY2018	lh	Incremental Common Shares Attributable To Stock Options IncrementalCommonSharesAttributableToStockOptions	1200000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0	shares
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1556100000	USD
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	98000000.0	shares
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	15.88
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	823800000	USD
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	98600000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.35
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	883700000	USD
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	102600000	shares
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.61
CY2020	us-gaap	Earnings Per Share Potentially Dilutive Securities EarningsPerSharePotentiallyDilutiveSecurities	0.2
CY2019	us-gaap	Earnings Per Share Potentially Dilutive Securities EarningsPerSharePotentiallyDilutiveSecurities	0.2
CY2018	us-gaap	Earnings Per Share Potentially Dilutive Securities EarningsPerSharePotentiallyDilutiveSecurities	0.1
CY2020	lh	Propertyplantandequipmentusefullifesoftwareminimum Propertyplantandequipmentusefullifesoftwareminimum	3	Y
CY2020	lh	Propertyplantandequipmentusefullifesoftwaremaximum Propertyplantandequipmentusefullifesoftwaremaximum	10	Y
CY2020	lh	Property Plant And Equipment Useful Life Software Average PropertyPlantAndEquipmentUsefulLifeSoftwareAverage	5	Y
CY2020Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	403600000	USD
CY2019Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	228300000	USD
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	19600000	USD
CY2019Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	16400000	USD
CY2020Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	20200000	USD
CY2019Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	0.0	USD
CY2020Q4	lh	Income Tax Benefit Minimum Certainty Percentage IncomeTaxBenefitMinimumCertaintyPercentage	0.50
CY2019	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	21200000	USD
CY2020	lh	Percentof Revenue Contributed PercentofRevenueContributed	1
CY2019	lh	Percentof Revenue Contributed PercentofRevenueContributed	1
CY2018	lh	Percentof Revenue Contributed PercentofRevenueContributed	1
CY2020	lh	Percent Of Domestic Revenue PercentOfDomesticRevenue	0.801
CY2019	lh	Percent Of Domestic Revenue PercentOfDomesticRevenue	0.777
CY2018	lh	Percent Of Domestic Revenue PercentOfDomesticRevenue	0.780
CY2020	lh	Sales Commission Amortization Period Minimum SalesCommissionAmortizationPeriodMinimum	P12M
CY2020	lh	Sales Commission Amortization Period Maximum SalesCommissionAmortizationPeriodMaximum	P57M
CY2020Q4	us-gaap	Accrued Sales Commission Current And Noncurrent AccruedSalesCommissionCurrentAndNoncurrent	32600000	USD
CY2019Q4	us-gaap	Accrued Sales Commission Current And Noncurrent AccruedSalesCommissionCurrentAndNoncurrent	28600000	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	12600000	USD
CY2019Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	14900000	USD
CY2020Q4	us-gaap	Amount Of Deferred Costs Related To Long Term Contracts AmountOfDeferredCostsRelatedToLongTermContracts	45200000	USD
CY2019Q4	us-gaap	Amount Of Deferred Costs Related To Long Term Contracts AmountOfDeferredCostsRelatedToLongTermContracts	43500000	USD
CY2020	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	23200000	USD
CY2018	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	16900000	USD
CY2020	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	10100000	USD
CY2019	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	8700000	USD
CY2018	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	4400000	USD
CY2020Q4	us-gaap	Accounts Receivable Billed For Long Term Contracts Or Programs AccountsReceivableBilledForLongTermContractsOrPrograms	1001500000	USD
CY2019Q4	us-gaap	Accounts Receivable Billed For Long Term Contracts Or Programs AccountsReceivableBilledForLongTermContractsOrPrograms	771100000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Gross ContractWithCustomerAssetGross	548100000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Gross ContractWithCustomerAssetGross	483700000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	492200000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	449200000	USD
CY2020	us-gaap	Deferred Revenue Revenue Recognized1 DeferredRevenueRevenueRecognized1	262600000	USD
CY2019	us-gaap	Deferred Revenue Revenue Recognized1 DeferredRevenueRevenueRecognized1	250200000	USD
CY2020	lh	Long Term Contracts Duration Minimum LongTermContractsDurationMinimum	P1Y
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	19000000.0	USD
CY2019Q4	lh	Unbilled Services Allowancefor Credit Loss UnbilledServicesAllowanceforCreditLoss	2300000	USD
CY2019Q4	lh	Note Receivable Allowancefor Credit Loss NoteReceivableAllowanceforCreditLoss	0	USD
CY2019Q4	lh	Allowancefor Credit Loss AllowanceforCreditLoss	21300000	USD
CY2020	lh	Current Expected Credit Losses Opening Balance Sheet Impacton Retained Earnings CurrentExpectedCreditLossesOpeningBalanceSheetImpactonRetainedEarnings	7000000.0	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	7000000.0	USD
CY2020	lh	Unbilled Services Credit Loss Expense Reversal UnbilledServicesCreditLossExpenseReversal	9000000.0	USD
CY2020	lh	Note Receivable Credit Loss Expense Reversal NoteReceivableCreditLossExpenseReversal	700000	USD
CY2020	lh	Credit Loss Expense Reversal CreditLossExpenseReversal	16700000	USD
CY2020	lh	Allowancefor Credit Loss Write Off AllowanceforCreditLossWriteOff	5900000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	22100000	USD
CY2020Q4	lh	Unbilled Services Allowancefor Credit Loss UnbilledServicesAllowanceforCreditLoss	11300000	USD
CY2020Q4	lh	Note Receivable Allowancefor Credit Loss NoteReceivableAllowanceforCreditLoss	5700000	USD
CY2020Q4	lh	Allowancefor Credit Loss AllowanceforCreditLoss	39100000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	5128400000	USD
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	4520800000	USD
CY2020Q4	lh	Percentofremainingperformanceobligationsrecognizedasrevenueinnextyear Percentofremainingperformanceobligationsrecognizedasrevenueinnextyear	0.260
CY2020	lh	Long Term Contracts Duration Maximum LongTermContractsDurationMaximum	P8Y
CY2020	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	80900000	USD
CY2019	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	88900000	USD
CY2020	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P15Y
CY2019Q4	us-gaap	Notes Receivable Fair Value Disclosure NotesReceivableFairValueDisclosure	110000000.0	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-12200000	USD
CY2019Q4	us-gaap	Notes Receivable Fair Value Disclosure NotesReceivableFairValueDisclosure	110000000.0	USD
CY2019Q2	lh	Totalacquisitionconsiderationcashstocknotesetc. Totalacquisitionconsiderationcashstocknotesetc.	711000000.0	USD
CY2019Q4	us-gaap	Notes Receivable Fair Value Disclosure NotesReceivableFairValueDisclosure	110000000.0	USD
CY2019Q2	lh	Totalacquisitionconsiderationcashstocknotesetc. Totalacquisitionconsiderationcashstocknotesetc.	711000000.0	USD
CY2019	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	184300000	USD
CY2018	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	7600000	USD
CY2020	lh	Net Restructuring Charges NetRestructuringCharges	40600000	USD
CY2020	us-gaap	Severance Costs1 SeveranceCosts1	14100000	USD
CY2020	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	17400000	USD
CY2020	us-gaap	Business Exit Costs1 BusinessExitCosts1	18900000	USD
CY2020	lh	Employee Severance Benefits Related Restructuring Reserve Accrual Adjustment EmployeeSeveranceBenefitsRelatedRestructuringReserveAccrualAdjustment	600000	USD
CY2020	lh	Facility Related Restructuring Reserve Accrual Adjustment FacilityRelatedRestructuringReserveAccrualAdjustment	9200000	USD
CY2019	lh	Net Restructuring Charges NetRestructuringCharges	54600000	USD
CY2019	us-gaap	Severance Costs1 SeveranceCosts1	32900000	USD
CY2019	us-gaap	Business Exit Costs1 BusinessExitCosts1	24900000	USD
CY2019	lh	Employee Severance Benefits Related Restructuring Reserve Accrual Adjustment EmployeeSeveranceBenefitsRelatedRestructuringReserveAccrualAdjustment	1700000	USD
CY2019	lh	Facility Related Restructuring Reserve Accrual Adjustment FacilityRelatedRestructuringReserveAccrualAdjustment	1500000	USD
CY2018	lh	Net Restructuring Charges NetRestructuringCharges	48100000	USD
CY2018	us-gaap	Severance Costs1 SeveranceCosts1	40300000	USD
CY2018	us-gaap	Business Exit Costs1 BusinessExitCosts1	11800000	USD
CY2018	lh	Employee Severance Benefits Related Restructuring Reserve Accrual Adjustment EmployeeSeveranceBenefitsRelatedRestructuringReserveAccrualAdjustment	2000000.0	USD
CY2018	lh	Facility Related Restructuring Reserve Accrual Adjustment FacilityRelatedRestructuringReserveAccrualAdjustment	2000000.0	USD
CY2018	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	2300000	USD
CY2018Q4	us-gaap	Restructuring Reserve RestructuringReserve	43600000	USD
CY2019	lh	Reclass For Adoption Of Asc842 ReclassForAdoptionOfASC842	32800000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	33100000	USD
CY2019	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	24700000	USD
CY2019	us-gaap	Restructuring Reserve Accrual Adjustment1 RestructuringReserveAccrualAdjustment1	3200000	USD
CY2019	lh	Restructuring Reserve Settled With Cash And Other Adjustment RestructuringReserveSettledWithCashAndOtherAdjustment	52000000.0	USD
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	13400000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	33000000.0	USD
CY2020	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	17400000	USD
CY2020	us-gaap	Restructuring Reserve Accrual Adjustment1 RestructuringReserveAccrualAdjustment1	9800000	USD
CY2020	lh	Restructuring Reserve Settled With Cash And Other Adjustment RestructuringReserveSettledWithCashAndOtherAdjustment	46200000	USD
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	7800000	USD
CY2020Q4	us-gaap	Restructuring Reserve Current RestructuringReserveCurrent	5700000	USD
CY2020Q4	us-gaap	Restructuring Reserve Noncurrent RestructuringReserveNoncurrent	2100000	USD
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	7800000	USD
CY2020	lh	Numberofyearsrestructuringliabilitiesexpectedtobepaidoutover Numberofyearsrestructuringliabilitiesexpectedtobepaidoutover	P4Y10M24D
CY2020Q4	us-gaap	Lessee Operating Lease Term Of Contract LesseeOperatingLeaseTermOfContract	P13Y
CY2020Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P15Y
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	215400000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	224000000.0	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	11200000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	11100000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	4700000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	6700000	USD
CY2020	us-gaap	Lease Cost LeaseCost	15900000	USD
CY2019	us-gaap	Lease Cost LeaseCost	17800000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	213800000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	227300000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	4700000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	6700000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	15200000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	8900000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	185900000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	132600000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	200000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	789800000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	732800000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	79700000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	87700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	8400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	84400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	91100000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	91100000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	99500000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y7M6D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y7M6D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P15Y10M24D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P15Y6M
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.033
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.041
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.051
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.052
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	206100000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	12700000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	162900000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	11600000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	119800000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	11400000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	85800000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	10500000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	71500000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	7700000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	354800000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	89200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	1000900000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	422400000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	143100000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	131300000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	52000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6700000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	84400000	USD
CY2020	us-gaap	Variable Lease Payment VariableLeasePayment	26700000	USD
CY2019	us-gaap	Variable Lease Payment VariableLeasePayment	20800000	USD
CY2018	us-gaap	Operating Lease Expense OperatingLeaseExpense	358700000	USD
CY2020Q4	lh	Canadian Licenses Alberta Canada CanadianLicensesAlbertaCanada	22400000	USD
CY2020Q4	lh	Ah Stransferto Canadian Jv AHStransfertoCanadianJV	50000000.0	CAD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	22100000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	19000000.0	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	2479800000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1543900000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4932700000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4565300000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2203100000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1928700000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2729600000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2636600000	USD
CY2020	lh	Software Depreciation SoftwareDepreciation	84700000	USD
CY2019	lh	Software Depreciation SoftwareDepreciation	90400000	USD
CY2018	lh	Software Depreciation SoftwareDepreciation	92700000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	7865000000.0	USD
CY2018Q4	us-gaap	Goodwill Goodwill	7360300000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	166200000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	494500000	USD
CY2020	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	0	USD
CY2019	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	-12600000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	142700000	USD
CY2019	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	22800000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	7751500000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	7865000000.0	USD
CY2020Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	6090100000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2129000000.0	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	3961100000	USD
CY2019Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	5885600000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1851100000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	4034500000	USD
CY2020	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	462100000	USD
CY2020	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	121300000	USD
CY2020	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P12Y8M12D
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	275400000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	243200000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	231700000	USD
CY2020	lh	Adjustmentstointangiblesthroughamortizationexpense Adjustmentstointangiblesthroughamortizationexpense	0.0	USD
CY2019	lh	Adjustmentstointangiblesthroughamortizationexpense Adjustmentstointangiblesthroughamortizationexpense	400000	USD
CY2018	lh	Adjustmentstointangiblesthroughamortizationexpense Adjustmentstointangiblesthroughamortizationexpense	4500000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	365500000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	220800000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	217800000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	213200000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	200800000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	2160500000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	623200000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	474600000	USD
CY2020Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	374800000	USD
CY2019Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	156700000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	359700000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	311100000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1357700000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	942400000	USD
CY2020Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	220500000	USD
CY2019Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	188400000	USD
CY2020Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	89200000	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	76700000	USD
CY2020Q4	lh	Other Liabilities Noncurrent Other OtherLiabilitiesNoncurrentOther	216700000	USD
CY2019Q4	lh	Other Liabilities Noncurrent Other OtherLiabilitiesNoncurrentOther	118100000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	526400000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	383200000	USD
CY2020Q4	lh	A4.625 Seniornotesdue2020 A4.625Seniornotesdue2020	0	USD
CY2019Q4	lh	A4.625 Seniornotesdue2020 A4.625Seniornotesdue2020	413700000	USD
CY2020Q4	lh	Shorttermdebtissuancecosts Shorttermdebtissuancecosts	400000	USD
CY2019Q4	lh	Shorttermdebtissuancecosts Shorttermdebtissuancecosts	700000	USD
CY2020Q4	us-gaap	Notes Payable Current NotesPayableCurrent	2100000	USD
CY2019Q4	us-gaap	Notes Payable Current NotesPayableCurrent	2200000	USD
CY2020Q4	us-gaap	Debt Current DebtCurrent	376700000	USD
CY2019Q4	us-gaap	Debt Current DebtCurrent	415200000	USD
CY2020Q4	lh	A3.75 Seniornotesdue2022 A3.75Seniornotesdue2022	500000000.0	USD
CY2019Q4	lh	A3.75 Seniornotesdue2022 A3.75Seniornotesdue2022	500000000.0	USD
CY2020Q4	lh	A3.20 Seniornotesdue2022 A3.20Seniornotesdue2022	500000000.0	USD
CY2019Q4	lh	A3.20 Seniornotesdue2022 A3.20Seniornotesdue2022	500000000.0	USD
CY2020Q4	lh	A4.00 Seniornotesdue2023 A4.00Seniornotesdue2023	300000000.0	USD
CY2019Q4	lh	A4.00 Seniornotesdue2023 A4.00Seniornotesdue2023	300000000.0	USD
CY2020Q4	lh	Seniornotesdue2024 Seniornotesdue2024	600000000.0	USD
CY2019Q4	lh	Seniornotesdue2024 Seniornotesdue2024	600000000.0	USD
CY2020Q4	lh	A3.60 Seniornotesdue2025 A3.60Seniornotesdue2025	1000000000.0	USD
CY2019Q4	lh	A3.60 Seniornotesdue2025 A3.60Seniornotesdue2025	1000000000.0	USD
CY2020Q4	lh	Seniornotesdue2027 Seniornotesdue2027	600000000.0	USD
CY2019Q4	lh	Seniornotesdue2027 Seniornotesdue2027	600000000.0	USD
CY2020Q4	lh	A4.70 Seniornotesdue2045 A4.70Seniornotesdue2045	900000000.0	USD
CY2019Q4	lh	A4.70 Seniornotesdue2045 A4.70Seniornotesdue2045	900000000.0	USD
CY2020Q4	lh	A2.30seniornotesdue2024 A2.30seniornotesdue2024	400000000.0	USD
CY2019Q4	lh	A2.30seniornotesdue2024 A2.30seniornotesdue2024	400000000.0	USD
CY2020Q4	lh	A2.95seniornotesdue2029 A2.95seniornotesdue2029	650000000.0	USD
CY2019Q4	lh	A2.95seniornotesdue2029 A2.95seniornotesdue2029	650000000.0	USD
CY2020Q4	lh	Longtermdebtissuancecosts Longtermdebtissuancecosts	37100000	USD
CY2019Q4	lh	Longtermdebtissuancecosts Longtermdebtissuancecosts	42200000	USD
CY2020Q4	us-gaap	Long Term Notes Payable LongTermNotesPayable	6100000	USD
CY2019Q4	us-gaap	Long Term Notes Payable LongTermNotesPayable	7000000.0	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5419000000.0	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5789800000	USD
CY2019Q2	lh	A2019 Term Loan A2019TermLoan	850000000.0	USD
CY2017Q3	lh	A2017 Termloan A2017Termloan	750000000.0	USD
CY2014Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	1000000000.0	USD
CY2014Q4	lh	Credit Facility Optionto Increase CreditFacilityOptiontoIncrease	350000000.0	USD
CY2014Q4	lh	Credit Facility Maximum Swing Line Borrowings CreditFacilityMaximumSwingLineBorrowings	100000000.0	USD
CY2020Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	997000000.0	USD
CY2020Q4	lh	Balance Of Senior Notes Mature During Q42020 BalanceOfSeniorNotesMatureDuringQ42020	412200000	USD
CY2020Q4	lh	Gain Recognizedon Exitof Interest Rate Swap Arrangement GainRecognizedonExitofInterestRateSwapArrangement	1600000	USD
CY2019Q4	us-gaap	Senior Long Term Notes SeniorLongTermNotes	1050000000.0	USD
CY2019Q4	us-gaap	Line Of Credit Facility Fair Value Of Amount Outstanding LineOfCreditFacilityFairValueOfAmountOutstanding	348300000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	4000000.0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	376700000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Two LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo	1000000000.0	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Three LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree	300000000.0	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Four LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour	1000000000.0	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Five LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive	1000000000.0	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal After Year Five LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive	2156100000	USD
CY2020Q4	lh	Longtermdebtfutureminimumpaymentsinterestincludedinpayments Longtermdebtfutureminimumpaymentsinterestincludedinpayments	5832800000	USD
CY2020Q4	lh	Total Shortand Long Term Debt Issuance Costs TotalShortandLongTermDebtIssuanceCosts	37100000	USD
CY2020Q4	lh	Long Term Debt Excluding Debt Issuance Costs LongTermDebtExcludingDebtIssuanceCosts	5795700000	USD
CY2020Q4	us-gaap	Debt Current DebtCurrent	376700000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	5419000000.0	USD
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	265000000.0	shares
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	30000000.0	shares
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.10
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	97200000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	122400000	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	125100000	shares
CY2020	lh	Commons Stock Issued During Period Shares Employee Stock Plans CommonsStockIssuedDuringPeriodSharesEmployeeStockPlans	900000	shares
CY2019	lh	Commons Stock Issued During Period Shares Employee Stock Plans CommonsStockIssuedDuringPeriodSharesEmployeeStockPlans	1200000	shares
CY2018	lh	Commons Stock Issued During Period Shares Employee Stock Plans CommonsStockIssuedDuringPeriodSharesEmployeeStockPlans	1600000	shares
CY2020	us-gaap	Stock Issued During Period Shares Conversion Of Convertible Securities StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	0	shares
CY2019	us-gaap	Stock Issued During Period Shares Conversion Of Convertible Securities StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	100000	shares
CY2018	us-gaap	Stock Issued During Period Shares Conversion Of Convertible Securities StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	0	shares
CY2020	us-gaap	Treasury Stock Shares Retired TreasuryStockSharesRetired	0	shares
CY2019	us-gaap	Treasury Stock Shares Retired TreasuryStockSharesRetired	23600000	shares
CY2018	us-gaap	Treasury Stock Shares Retired TreasuryStockSharesRetired	0	shares
CY2020	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	600000	shares
CY2019	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	2900000	shares
CY2018	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	4300000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	97500000	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	97200000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	122400000	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	0	shares
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	23500000	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	23200000	shares
CY2020	us-gaap	Stock Issued During Period Shares Restricted Stock Award Forfeited StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	0	shares
CY2019	us-gaap	Stock Issued During Period Shares Restricted Stock Award Forfeited StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	100000	shares
CY2018	us-gaap	Stock Issued During Period Shares Restricted Stock Award Forfeited StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	300000	shares
CY2020	us-gaap	Treasury Stock Shares Retired TreasuryStockSharesRetired	0	shares
CY2019	us-gaap	Treasury Stock Shares Retired TreasuryStockSharesRetired	23600000	shares
CY2018	us-gaap	Treasury Stock Shares Retired TreasuryStockSharesRetired	0	shares
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	0	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	0	shares
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	23500000	shares
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	600000	shares
CY2020	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	178.85
CY2020Q4	lh	Valueof Common Stock Repurchased ValueofCommonStockRepurchased	100000000.0	USD
CY2020Q4	lh	Common Stock Repurchase Authorization Outstanding CommonStockRepurchaseAuthorizationOutstanding	800000000.0	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-389800000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	73300000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	104400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	-22500000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	81900000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	5100000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	5100000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Translation Gain Loss Arising During Period Tax OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	3700000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-3700000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-285400000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	87000000.0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	264100000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	-72900000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Before Tax OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	191200000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	7200000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	7200000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Translation Gain Loss Arising During Period Tax OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	12100000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-12100000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-21300000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	140600000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1846500000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	61200000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	784400000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	937700000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	372500000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	320500000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	330600000	USD
CY2020	lh	Income Loss From Continuing Operations Before Income Taxes And Minority Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndMinorityInterest	2219100000	USD
CY2019	lh	Income Loss From Continuing Operations Before Income Taxes And Minority Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndMinorityInterest	1104900000	USD
CY2018	lh	Income Loss From Continuing Operations Before Income Taxes And Minority Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndMinorityInterest	1268300000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	455300000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	126700000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	225800000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	172800000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	40200000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	81000000.0	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	83900000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	64300000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	709100000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	250800000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	351300000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-6700000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	38200000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2500000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-28100000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2500000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	30000000.0	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-12200000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-11500000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	5600000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-47000000.0	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	29200000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	33100000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	662100000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	280000000.0	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	384400000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.053
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.032
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.034
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.004
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.001
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.003
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Restructuring Charges EffectiveIncomeTaxRateReconciliationNondeductibleExpenseRestructuringCharges	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Restructuring Charges EffectiveIncomeTaxRateReconciliationNondeductibleExpenseRestructuringCharges	0.007
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Restructuring Charges EffectiveIncomeTaxRateReconciliationNondeductibleExpenseRestructuringCharges	0.019
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.024
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0.012
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0.040
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0
CY2020	lh	Effective Income Tax Rate Reconciliation Gilti Impact Percent EffectiveIncomeTaxRateReconciliationGILTIImpactPercent	-0.001
CY2019	lh	Effective Income Tax Rate Reconciliation Gilti Impact Percent EffectiveIncomeTaxRateReconciliationGILTIImpactPercent	0.011
CY2018	lh	Effective Income Tax Rate Reconciliation Gilti Impact Percent EffectiveIncomeTaxRateReconciliationGILTIImpactPercent	0.010
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.006
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.298
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.253
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.303
CY2018	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	45000000.0	USD
CY2018	us-gaap	Foreign Earnings Repatriated ForeignEarningsRepatriated	14800000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit	30100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	20000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	16900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	115600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	105100000	USD
CY2020Q4	lh	Deferred Tax Asset Right Of Use Asset DeferredTaxAssetRightOfUseAsset	187600000	USD
CY2019Q4	lh	Deferred Tax Asset Right Of Use Asset DeferredTaxAssetRightOfUseAsset	191400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Restructuring Charges DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges	22600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Restructuring Charges DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges	9900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	206800000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	207100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	126800000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	62900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	679400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	593300000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	167600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	145400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	511800000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	447900000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	179500000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	177300000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	912500000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	910500000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	203900000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	194600000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	46300000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	57400000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1342200000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1339800000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	830400000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	891900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	145400000	USD
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CY2020	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	5800000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	0	USD
CY2018	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	3400000	USD
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CY2019	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	11500000	USD
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CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	167600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	145400000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	156900000	USD
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CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	1600000	USD
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Files In Submission

Name	View Source	Status
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0000920148-21-000018-index.html	Edgar Link	pending
0000920148-21-000018.txt	Edgar Link	pending
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$LH
LABCORP HOLDINGS INC. Stock $lh

2020 Q4 Form 10-K Financial Statement

#000092014821000018 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LH LABCORP HOLDINGS INC. Stock $lh

2020 Q4 Form 10-K Financial Statement

#000092014821000018 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LH
LABCORP HOLDINGS INC. Stock $lh