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Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Interest rate derivatives [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities   $ 120.1
Gross Amounts Offset in the Balance Sheet   0.0
Amounts of Liabilities Presented in the Balance Sheet   120.1
Financial Instruments   0.0
Cash Collateral Received   0.0
Cash Collateral Paid   0.0
Amounts That Would Have Been Presented On Net Basis   120.1
Commodity Derivatives [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 249.5 246.3
Gross Amounts Offset in the Balance Sheet 0.0 0.0
Amounts of Liabilities Presented in the Balance Sheet 249.5 246.3
Financial Instruments (248.7) (228.5)
Cash Collateral Received 0.0 0.0
Cash Collateral Paid 0.0 (17.3)
Amounts That Would Have Been Presented On Net Basis $ 0.8 $ 0.5