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Income Taxes - Components of Income Tax Expense (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:        
Federal   $ 12.5 $ 51.2 $ 4.4
State and local   2.0 0.9 1.1
Foreign   26.6 21.0 15.3
Total Current Income Tax   41.1 73.1 20.8
Deferred:        
Federal   4.2 (8.1) (0.7)
State and local   0.3 0.7 (0.3)
Foreign   1.0 0.6 2.0
Total Deferred Income Tax   5.5 (6.8) 1.0
Total $ 12.3 $ 46.6 $ 66.3 $ 21.8