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Income Taxes - Components of Income Tax Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ 6.1 $ 13.8 $ 12.5
State and local 0.5 2.3 2.0
Foreign 6.8 22.9 26.6
Total Current Income Tax 13.4 39.0 41.1
Deferred:      
Federal (2.8) (3.0) 4.2
State and local (0.4) (0.5) 0.3
Foreign 0.8 2.7 1.0
Total Deferred Income Tax (2.4) (0.8) 5.5
Total $ 11.0 $ 38.2 $ 46.6