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Income Taxes - Income Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
U.S. loss $ (721.6) $ (889.0) $ (549.4)
Non - U.S. income 111.3 356.0 435.5
Loss before income taxes $ (610.3) $ (533.0) $ (113.9)