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Components of Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Expense Benefit [Line Items]      
Taxes on income $ 124.2 $ 136.7 $ 157.6
Domestic Tax Authority      
Income Tax Expense Benefit [Line Items]      
Current 112.0 111.9 120.9
Deferred 0.8 2.0 11.1
Domestic 112.8 113.9 132.0
U.S.      
Income Tax Expense Benefit [Line Items]      
Foreign taxes, Current 1.7 15.3 19.9
Foreign taxes, Deferred 9.7 7.5 5.7
Foreign $ 11.4 $ 22.8 $ 25.6