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Income Taxes Income by Region (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
U.S. $ (1,505.4) $ 190.2 $ 190.8
Non-U.S. 23.5 51.4 56.9
Income (loss) before income taxes $ (1,481.9) $ 241.6 $ 247.7