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Derivative Instruments, Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Interest rate derivatives [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 39.3 $ 36.5
Gross Amounts Offset in the Balance Sheet 0.0 0.0
Amounts of Assets Presented in the Balance Sheet 39.3 36.5
Financial Instruments (0.6) (0.2)
Cash Collateral Received 0.0 0.0
Cash Collateral Paid 0.0 0.0
Amounts That Would Have Been Presented On Net Basis 38.7 36.3
Commodity Derivatives [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 41.2 541.4
Gross Amounts Offset in the Balance Sheet 0.0 0.0
Amounts of Assets Presented in the Balance Sheet 41.2 541.4
Financial Instruments (38.0) (526.8)
Cash Collateral Received 0.0 0.0
Cash Collateral Paid 0.0 0.0
Amounts That Would Have Been Presented On Net Basis $ 3.2 $ 14.6