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Derivative Instruments, Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Interest rate derivatives [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 118.6  
Gross Amounts Offset in the Balance Sheet 0.0  
Amounts of Liabilities Presented in the Balance Sheet 118.6  
Financial Instruments 0.0  
Cash Collateral Received 0.0  
Cash Collateral Paid 0.0  
Amounts That Would Have Been Presented On Net Basis 118.6  
Commodity Derivatives [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 150.5 $ 162.4
Gross Amounts Offset in the Balance Sheet 0.0 0.0
Amounts of Liabilities Presented in the Balance Sheet 150.5 162.4
Financial Instruments (149.0) (158.6)
Cash Collateral Received 0.0 0.0
Cash Collateral Paid 0.3 (2.3)
Amounts That Would Have Been Presented On Net Basis $ 1.8 $ 1.5