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Income Taxes - Components of (Loss) Income Before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]      
U.S. $ (123.8) $ (65.1) $ (83.4)
Foreign 107.9 115.7 84.7
(Loss) income from continuing operations before income taxes $ (15.9) $ 50.6 $ 1.3