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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 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 $ (20.1) $ 4.6  
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 (246.7) (219.3)  
Total gains (losses) included in:      
Other comprehensive income 1.5 (1.5)  
Settlements (0.1) (0.5)  
Transfers out of Level 3 0.1 0.1  
Financial liability balance, net, end of period (242.3) (221.6)  
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities 0.6 (1.0)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Location - Revenue [Member]      
Total gains (losses) included in:      
Net income [1] 0.7 (0.4)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Location - Other Expense [Member]      
Total gains (losses) included in:      
Net income 2.2 $ 0.0  
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]      
Financial assets [Abstract]      
Interest rate derivatives 6.8   $ 3.2
Commodity derivatives 231.0   255.6
Total 237.8   258.8
Financial liabilities [Abstract]      
Liquidity Option Agreement 242.9   245.1
Interest rate derivatives     3.7
Commodity derivatives 289.2   143.0
Total 532.1   391.8
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member]      
Financial assets [Abstract]      
Interest rate derivatives 0.0   0.0
Commodity derivatives 114.8   109.5
Total 114.8   109.5
Financial liabilities [Abstract]      
Liquidity Option Agreement 0.0   0.0
Interest rate derivatives     0.0
Commodity derivatives 126.6   31.3
Total 126.6   31.3
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member]      
Financial assets [Abstract]      
Interest rate derivatives 6.8   3.2
Commodity derivatives 113.9   145.2
Total 120.7   148.4
Financial liabilities [Abstract]      
Liquidity Option Agreement 0.0   0.0
Interest rate derivatives     3.7
Commodity derivatives 160.9   109.2
Total 160.9   112.9
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member]      
Financial assets [Abstract]      
Interest rate derivatives 0.0   0.0
Commodity derivatives 2.3   0.9
Total 2.3   0.9
Financial liabilities [Abstract]      
Liquidity Option Agreement 242.9   245.1
Interest rate derivatives     0.0
Commodity derivatives 1.7   2.5
Total $ 244.6   $ 247.6
[1] There were $0.6 million of unrealized gains and $1.0 million of unrealized losses included in these amounts for the three months ended March 31, 2016 and 2015, respectively.