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Business Segment Reporting - Schedule of Segment Reporting Information (Footnote) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Gains on derivatives $ 11.3 $ (24.1)