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Derivative Instruments, Hedging Activities and Fair Value Measurements, Asset Balance Sheet Offsetting (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Interest rate derivatives [Member]
    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 26.1 $ 32.6
Gross Amounts Offset in the Balance Sheet 0 0
Amounts of Assets Presented in the Balance Sheet 26.1 32.6
Financial Instruments (1.7) (2.6)
Cash Collateral Received 0 0
Amounts That Would Have Been Presented On Net Basis 24.4 30.0
Commodity derivatives [Member]
    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 39.8 41.3
Gross Amounts Offset in the Balance Sheet 0 0
Amounts of Assets Presented in the Balance Sheet 39.8 41.3
Financial Instruments (24.8) (41.0)
Cash Collateral Received 0 0
Amounts That Would Have Been Presented On Net Basis $ 15.0 $ 0.3