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Income Taxes - Summary of Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current      
Federal $ 100.0 $ 94.9 $ 93.5
Foreign 55.9 35.1 26.4
State and other 27.5 21.5 24.1
Deferred      
Federal (1.8) (6.9) 3.2
Foreign (11.5) (3.1) (1.8)
State and Local (1.3) 2.5 1.6
Income tax expense as reported $ 168.8 $ 144.0 $ 147.0