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Income Taxes - Pre-tax Income Attributable to Operating Segments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income before income taxes:        
United States $ 120.2 $ 97.2 $ 179.0  
Rest of the world 70.9 91.2 92.8  
Income before income taxes $ 191.1 $ 188.4 $ 271.8 $ 191.1