Debt - Future Maturities Of Debt (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Unamortized debt issuance cost	$ 10.0	$ 9.6
Bond discount	$ 13.7

Amount, after accumulated amortization, of debt discount.

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Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant