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Derivative Instruments, Hedging Activities and Fair Value Measurements, Liability Balance Sheet Offsetting (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Interest rate derivatives [Member]
    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 2.6 $ 7.8
Gross Amounts Offset in the Balance Sheet 0 0
Amounts of Liabilities Presented in the Balance Sheet 2.6 7.8
Financial Instruments (0.9) (2.6)
Cash Collateral Paid 0 0
Amounts That Would Have Been Presented On Net Basis 1.7 5.2
Commodity derivatives [Member]
    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities 66.2 55.1
Gross Amounts Offset in the Balance Sheet 0 0
Amounts of Liabilities Presented in the Balance Sheet 66.2 55.1
Financial Instruments (31.5) (41.0)
Cash Collateral Paid (22.4) (9.3)
Amounts That Would Have Been Presented On Net Basis $ 12.3 $ 4.8