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Restructuring and Related Activities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]          
Impairment, restructuring and other expenses $ 0.0 $ 158.1 $ 0.0 $ 158.1 $ 0.0
Property, Plant and Equipment [Member] | Facility Closing [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Costs   109.9      
Asset Retirement Obligation Costs [Member] | Facility Closing [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Costs   37.1      
Other Current Assets [Member] | Facility Closing [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Costs   $ 11.1