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Income Taxes - Pre-tax Income Attributable to Operating Segments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income before income taxes:      
United States $ 319.5 $ 150.9 $ 59.2
Rest of the world 132.9 114.6 105.8
Income from continuing operations before income taxes $ 452.4 $ 265.5 $ 165.0