Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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Name:	us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Derivative Financial Instruments - Summary of Balance of Company's Derivative Instruments Designated as Cash Flow Hedge (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative [Line Items]
Amount of Gain/(Loss) in AOCI		$ (31.3)
Interest Rate Swap Agreement [Member]
Derivative [Line Items]
Amount of Gain/(Loss) in AOCI	$ (18.0)
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swap Agreement [Member]
Derivative [Line Items]
Amount of Gain/(Loss) in AOCI	$ 22.6		$ 25.7