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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]        
Income tax expense (benefit) $ (42.8) $ (182.4) $ (33.4) $ (148.5)
Effective income tax rate (32.20%) (72.40%) (4.10%) (40.10%)
Imposed under recent tax reforms $ 20.0   $ 20.0  
Reduction in uncertain tax positions   $ 244.0 $ 18.0  
Tax adjustments, settlements, and unusual provisions   $ 185.0