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Business Segment Reporting - Schedule of Segment Reporting Information (Footnote) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Gains on derivatives $ (1.5) $ (25.5) $ 7.8