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Income Taxes (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]      
Taxes Payable $ 111.7    
Deferred Income Taxes and Tax Credits (42.4) $ 0.0  
Long-term debt $ 1,033.5   $ 1,033.4