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Derivative Instruments - Balance Sheet Offsetting (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Cash collateral    
Cash collateral posted in margin accounts $ 18.9 $ 34.4
Offsetting derivative assets    
Gross amount recognized on the balance sheet 17.9 6.9
Gross amount not offset on the balance sheet (6.9) (1.4)
Net amount 11.0 5.5
Offsetting derivative liabilities    
Gross amount recognized on the balance sheet 22.1 28.9
Gross amount not offset on the balance sheet (7.7) (21.4)
Net amount 14.4 7.5
Cash collateral posted $ 0.8 $ 20.0