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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.

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