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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financial liabilities [Abstract]      
Liquidity Option Agreement $ 245.1 $ 219.7  
Total gains (losses) included in:      
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities 18.4 (30.6) $ (1.4)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Financial assets [Abstract]      
Financial assets 0.9 1.0  
Financial liabilities [Abstract]      
Financial liabilities 2.5 0.6  
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward]      
Financial asset (liability) balance, net, beginning of period (219.3) [1] 3.2  
Total gains (losses) included in:      
Other comprehensive income (loss) (19.2) (2.6)  
Settlements 0.1 (3.4)  
Acquisition of Liquidity Option Agreement 0.0 (219.7)  
Transfers out of Level 3 [1] 18.0 2.3  
Financial asset (liability) balance, net, end of period (246.7) [1] (219.3) [1] $ 3.2
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities (0.9) (2.6)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Location - Revenue [Member]      
Total gains (losses) included in:      
Net income [2] (0.9) 0.9  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Location - Other expense, net [Member]      
Total gains (losses) included in:      
Net income (25.4) 0.0  
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]      
Financial assets [Abstract]      
Interest rate derivatives 3.2    
Commodity derivatives 255.6 226.6  
Financial assets 258.8    
Financial liabilities [Abstract]      
Liquidity Option Agreement 245.1 219.7  
Interest rate derivatives 3.7    
Commodity derivatives 143.0 147.4  
Financial liabilities 391.8 367.1  
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member]      
Financial assets [Abstract]      
Interest rate derivatives 0.0    
Commodity derivatives 109.5 37.8  
Financial assets 109.5    
Financial liabilities [Abstract]      
Liquidity Option Agreement 0.0 0.0  
Interest rate derivatives 0.0    
Commodity derivatives 31.3 13.8  
Financial liabilities 31.3 13.8  
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member]      
Financial assets [Abstract]      
Interest rate derivatives 3.2    
Commodity derivatives 145.2 187.8  
Financial assets 148.4    
Financial liabilities [Abstract]      
Liquidity Option Agreement 0.0 0.0  
Interest rate derivatives 3.7    
Commodity derivatives 109.2 133.0  
Financial liabilities 112.9 133.0  
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member]      
Financial assets [Abstract]      
Interest rate derivatives 0.0    
Commodity derivatives 0.9 1.0  
Financial assets 0.9    
Financial liabilities [Abstract]      
Liquidity Option Agreement 245.1 219.7  
Interest rate derivatives 0.0    
Commodity derivatives 2.5 0.6  
Financial liabilities $ 247.6 $ 220.3  
[1] Transfers out of Level 3 into Level 2 were due to shorter remaining transaction maturities falling inside of the Level 2 range at December 31, 2015 and 2014.
[2] There were $0.9 million and $2.6 million of unrealized losses included in these amounts for the years ended December 31, 2015 and 2014, respectively.