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Income Taxes - Pre-tax Income Attributable to Operating Segments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income before income taxes:      
United States $ 120.2 $ 46.9 $ (4.5)
Rest of the world 79.9 128.0 132.5
Income before income taxes $ 200.1 $ 174.9 $ 128.0