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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, 2015
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Total gains (losses) included in:              
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities         $ 9.9 $ 6.2  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]              
Financial assets [Abstract]              
Commodity derivatives $ 0.8       0.8    
Financial liabilities [Abstract]              
Commodity derivatives 2.4       2.4    
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward]              
Financial asset (liability) balance, net, beginning of period (214.1) $ (211.8) $ 7.7 $ 3.2 (211.8) 3.2  
Total gains (losses) included in:              
Other comprehensive income (1.0) (1.5) 0.0 0.0      
Settlements 0.2 (0.5) (1.8) (0.1)      
Transfers out of Level 3 1.5 0.1 0.0 0.0      
Financial asset (liability) balance, net, end of period (225.3) (214.1) 2.6 7.7 (225.3) 2.6  
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities (0.1)   (5.0)   (1.1) $ (0.5)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Location - Revenue [Member]              
Total gains (losses) included in:              
Net income [1] (0.4) $ (0.4) (3.3) $ 4.6      
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Location - Other Expense [Member]              
Total gains (losses) included in:              
Net income (11.5)   $ 0.0        
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]              
Financial assets [Abstract]              
Interest rate derivatives 5.7       5.7    
Commodity derivatives 132.3       132.3   $ 226.6
Financial assets 138.0       138.0    
Financial liabilities [Abstract]              
Liquidity Option Agreement 223.7       223.7   212.2
Interest rate derivatives 5.5       5.5    
Commodity derivatives 131.3       131.3   147.4
Total 360.5       360.5   359.6
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member]              
Financial assets [Abstract]              
Interest rate derivatives 0.0       0.0    
Commodity derivatives 17.0       17.0   37.8
Financial assets 17.0       17.0    
Financial liabilities [Abstract]              
Liquidity Option Agreement 0.0       0.0   0.0
Interest rate derivatives 0.0       0.0    
Commodity derivatives 21.9       21.9   13.8
Total 21.9       21.9   13.8
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member]              
Financial assets [Abstract]              
Interest rate derivatives 5.7       5.7    
Commodity derivatives 114.5       114.5   187.8
Financial assets 120.2       120.2    
Financial liabilities [Abstract]              
Liquidity Option Agreement 0.0       0.0   0.0
Interest rate derivatives 5.5       5.5    
Commodity derivatives 107.0       107.0   133.0
Total 112.5       112.5   133.0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member]              
Financial assets [Abstract]              
Interest rate derivatives 0.0       0.0    
Commodity derivatives 0.8       0.8   1.0
Financial assets 0.8       0.8    
Financial liabilities [Abstract]              
Liquidity Option Agreement 223.7       223.7   212.2
Interest rate derivatives 0.0       0.0    
Commodity derivatives 2.4       2.4   0.6
Total $ 226.1       $ 226.1   $ 212.8
[1] There were $0.1 million and $1.1 million of unrealized losses included in these amounts for the three and six months ended June 30, 2015, respectively. There were unrealized losses of $5.0 million and $0.5 million included in these amounts for the three and six months ended June 30, 2014, respectively.