Income Taxes - Income From Continuing Operations, Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
United States	$ 490.3	$ 72.9	$ 344.3
Foreign	135.4	68.5	63.5
Income before income taxes	$ 625.7	$ 141.4	$ 407.8

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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