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Supplemental Financial Information (Other Current Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Apr. 30, 2021
Dec. 31, 2020
Supplemental Financial Information [Abstract]      
Prepaid taxes $ 45.4   $ 32.9
Prepaid expenses 28.4   43.4
Elimination of other deferred costs 17.3   17.4
Materials and supplies 0.0   279.4
Other 25.9   13.4
Other current assets $ 117.0 $ 90.5 $ 386.5