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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Total gains (losses) included in:              
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities         $ (68.3) $ 9.9  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]              
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward]              
Financial liability balance, net, beginning of period $ (242.3) $ (246.7) $ (221.6) $ (219.3) (246.7) (219.3)  
Total gains (losses) included in:              
Other comprehensive income 2.0 1.5 (1.0) (1.5)      
Settlements (0.1) (0.1) 0.2 (0.5)      
Transfers out of Level 3 0.0 0.1 1.5 0.1      
Financial liability balance, net, end of period (263.7) (242.3) (232.8) (221.6) (263.7) (232.8)  
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities (0.1)   (0.1)   0.5 $ (1.1)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Location - Revenue [Member]              
Total gains (losses) included in:              
Net income [1] 0.0 0.7 (0.4) (0.4)      
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Location - Other Expense [Member]              
Total gains (losses) included in:              
Net income (23.3) $ 2.2 $ (11.5) $ 0.0      
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]              
Financial assets [Abstract]              
Interest rate derivatives 6.5       6.5   $ 3.2
Commodity derivatives 282.8       282.8   255.6
Total 289.3       289.3   258.8
Financial liabilities [Abstract]              
Liquidity Option Agreement 266.2       266.2   245.1
Interest rate derivatives 9.4       9.4   3.7
Commodity derivatives 538.5       538.5   143.0
Total 814.1       814.1   391.8
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member]              
Financial assets [Abstract]              
Interest rate derivatives 0.0       0.0   0.0
Commodity derivatives 141.7       141.7   109.5
Total 141.7       141.7   109.5
Financial liabilities [Abstract]              
Liquidity Option Agreement 0.0       0.0   0.0
Interest rate derivatives 0.0       0.0   0.0
Commodity derivatives 277.8       277.8   31.3
Total 277.8       277.8   31.3
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member]              
Financial assets [Abstract]              
Interest rate derivatives 6.5       6.5   3.2
Commodity derivatives 135.0       135.0   145.2
Total 141.5       141.5   148.4
Financial liabilities [Abstract]              
Liquidity Option Agreement 0.0       0.0   0.0
Interest rate derivatives 9.4       9.4   3.7
Commodity derivatives 257.1       257.1   109.2
Total 266.5       266.5   112.9
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member]              
Financial assets [Abstract]              
Interest rate derivatives 0.0       0.0   0.0
Commodity derivatives 6.1       6.1   0.9
Total 6.1       6.1   0.9
Financial liabilities [Abstract]              
Liquidity Option Agreement 266.2       266.2   245.1
Interest rate derivatives 0.0       0.0   0.0
Commodity derivatives 3.6       3.6   2.5
Total $ 269.8       $ 269.8   $ 247.6
[1] There were unrealized losses of $0.1 million and unrealized gains of $0.5 million included in these amounts for the three and six months ended June 30, 2016, respectively. There were unrealized losses of $0.1 million and $1.1 million included in these amounts for the three and six months ended June 30, 2015, respectively.