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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Taxes        
Income tax provision (benefit) $ (3.7) $ (0.1) $ (10.3) $ 2.7
Extinguishment of Debt, Gain (Loss), Income Tax     60.0  
Foreign Tax Authority        
Income Taxes        
Income tax provision (benefit) $ (1.1) $ 1.1 $ (1.6) $ 0.4