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Income Taxes - Jurisdictions, Net Income (Loss) Subject to Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ 270.7 $ 119.1 $ (28.3)
Outside of the United States (45.7) (14.9) (98.2)
Total $ 225.0 $ 104.2 $ (126.5)