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Derivative Instruments, Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Interest rate derivatives [Member]
    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 0 $ 7.8
Gross Amounts Offset in the Balance Sheet 0 0
Amounts of Liabilities Presented in the Balance Sheet 0 7.8
Financial Instruments 0 (2.6)
Cash Collateral Paid 0 0
Amounts That Would Have Been Presented On Net Basis 0 5.2
Commodity derivatives [Member]
    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 22.0 55.1
Gross Amounts Offset in the Balance Sheet 0 0
Amounts of Liabilities Presented in the Balance Sheet 22.0 55.1
Financial Instruments (24.8) (41.0)
Cash Collateral Paid 7.8 (9.3)
Amounts That Would Have Been Presented On Net Basis $ 5.0 $ 4.8