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Income Taxes - Components of Loss Income Before Income Taxes and Noncontrolling Interests (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Income Before Income Tax [Line Items]      
Domestic operations $ 554.7 $ 513.8 $ 387.7
Foreign operations 80.1 68.3 72.2
Income before income taxes and noncontrolling interests $ 634.8 $ 582.1 $ 459.9