Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Income Tax Expense (Detail)

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Income Taxes - Components of Income Tax Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Foreign $ 147.1 $ 127.9 $ 147.0
Federal 10.6 12.4 35.4
State 1.8 0.8 3.1
Current Income Tax Expense (Benefit), Total 159.5 141.1 185.5
Deferred:      
Foreign (8.6) 12.5 (13.2)
Federal 106.4 (47.2) (23.8)
State   (1.7) (1.2)
Deferred Income Tax Expense (Benefit), Total 97.8 (36.4) (38.2)
Total $ 257.3 $ 104.7 $ 147.3