Income Taxes - Income From Continuing Operations, Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
United States	$ 480.7	$ 608.4	$ 495.4
Foreign	139.7	153.0	133.3
Income from continuing operations before income taxes	$ 620.4	$ 761.4	$ 628.7

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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+ Details