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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:      
Federal $ 51.2 $ 4.4 $ 5.2
State and local 0.9 1.1 1.3
Foreign 21.0 15.3 14.3
Total Current Income Tax 73.1 20.8 20.8
Deferred:      
Federal (8.1) (0.7) 12.8
State and local 0.7 (0.3) 0.5
Foreign 0.6 2.0 (1.3)
Total Deferred Income Tax (6.8) 1.0 12.0
Total $ 66.3 $ 21.8 $ 32.8