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Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Interest rate derivatives [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets   $ 12.4
Gross Amounts Offset in the Balance Sheet   0.0
Amounts of Assets Presented in the Balance Sheet   12.4
Financial Instruments   0.0
Cash Collateral Received   0.0
Cash Collateral Paid   0.0
Amounts That Would Have Been Presented On Net Basis   12.4
Commodity Derivatives [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 324.9 229.2
Gross Amounts Offset in the Balance Sheet 0.0 0.0
Amounts of Assets Presented in the Balance Sheet 324.9 229.2
Financial Instruments (248.7) (228.5)
Cash Collateral Received (68.0) 0.0
Cash Collateral Paid 0.0 0.0
Amounts That Would Have Been Presented On Net Basis $ 8.2 $ 0.7