Balance Sheet Classification, Fair Value and Gross and Net Amounts of Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Assets gross amount recognized in balance sheets	$ 0.5	$ 10.3
Less amounts not offset in financial instruments	(0.5)	(6.9)
Pro forma net amount		3.4
Liabilities gross amount recognized in balance sheets	20.9	18.0
Less amounts not offset in financial instruments	(0.5)	(6.9)
Pro forma net amount	20.4	11.1
Interest Rate Contract \| Other Assets
Derivatives, Fair Value [Line Items]
Assets gross amount recognized in balance sheets	0.5	10.3
Interest Rate Contract \| Accounts Payable, Accrued Expenses and Other
Derivatives, Fair Value [Line Items]
Liabilities gross amount recognized in balance sheets	$ 20.9	$ 18.0

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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