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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Level 3 [Member]
Sep. 30, 2014
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Jun. 30, 2014
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2014
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2014
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2014
Fair Value, Measurements, Recurring [Member]
Fair Value [Member]
Level 1 [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value [Member]
Level 1 [Member]
Sep. 30, 2014
Fair Value, Measurements, Recurring [Member]
Fair Value [Member]
Level 2 [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value [Member]
Level 2 [Member]
Sep. 30, 2014
Fair Value, Measurements, Recurring [Member]
Fair Value [Member]
Level 3 [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value [Member]
Level 3 [Member]
Sep. 30, 2014
Fair Value, Measurements, Recurring [Member]
Carrying Value [Member]
Dec. 31, 2013
Fair Value, Measurements, Recurring [Member]
Carrying Value [Member]
Financial assets [Abstract]                                      
Interest rate derivatives                       $ 0 $ 0 $ 19.4 $ 32.6 $ 0 $ 0 $ 19.4 $ 32.6
Commodity derivatives     2.9                 14.4 17.2 24.4 20.2 2.9 3.9 41.7 41.3
Financial assets                       14.4 17.2 43.8 52.8 2.9 3.9 61.1 73.9
Financial liabilities [Abstract]                                      
Interest rate derivatives                       0 0 0 7.8 0 0 0 7.8
Commodity derivatives     3.6                 8.2 30.8 10.2 23.6 3.6 0.7 22.0 55.1
Financial liabilities                       8.2 30.8 10.2 31.4 3.6 0.7 22.0 62.9
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward]                                      
Financial asset (liability) balance, net, beginning of period       2.6 [1] 7.7 3.2 (0.2) [1] (0.6) (1.5) 3.2 (1.5)                
Total gains (losses) included in:                                      
Net income       (0.9) (3.3) [2] 4.6 [2] 1.1 (0.2) [2] (0.6) [2]                    
Other comprehensive income (loss)       (2.5)     (0.9)                        
Settlements       0.1 (1.8) (0.1) 0.1 0.6 1.5                    
Financial asset (liability) balance, net, end of period       (0.7) 2.6 [1] 7.7 0.1 (0.2) [1] (0.6) (0.7) 0.1                
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities $ 3.8 $ 5.3   $ (0.8)     $ 1.1     $ (1.3) $ 2.4                
[1] There were no transfers into or out of Level 3 during the three or nine months ended September 30, 2014 and 2013.
[2] There were $0.8 million and $1.3 million of unrealized losses included in these amounts for the three and nine months ended September 30, 2014, respectively. There were unrealized gains of $1.1 million and $2.4 million included in these amounts for the three and nine months ended September 30, 2013, respectively.