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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  |  |  |  |  |  |  |  | $ 6.2 |  | $ 1.2 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 27.3 |  |  |  |  |  |  |  | 27.3 |  |  |  | 32.6
Commodity derivatives | 44.1 |  |  |  |  |  |  |  | 44.1 |  |  |  | 41.3
Financial assets | 71.4 |  |  |  |  |  |  |  | 71.4 |  |  |  | 73.9
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 2.6 |  |  |  |  |  |  |  | 2.6 |  |  |  | 7.8
Commodity derivatives | 66.2 |  |  |  |  |  |  |  | 66.2 |  |  |  | 55.1
Financial liabilities | 68.8 |  |  |  |  |  |  |  | 68.8 |  |  |  | 62.9
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 0 |  |  |  |  |  |  |  | 0 |  |  |  | 0
Commodity derivatives | 18.0 |  |  |  |  |  |  |  | 18.0 |  |  |  | 17.2
Financial assets | 18.0 |  |  |  |  |  |  |  | 18.0 |  |  |  | 17.2
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 0 |  |  |  |  |  |  |  | 0 |  |  |  | 0
Commodity derivatives | 32.1 |  |  |  |  |  |  |  | 32.1 |  |  |  | 30.8
Financial liabilities | 32.1 |  |  |  |  |  |  |  | 32.1 |  |  |  | 30.8
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 27.3 |  |  |  |  |  |  |  | 27.3 |  |  |  | 32.6
Commodity derivatives | 22.0 |  |  |  |  |  |  |  | 22.0 |  |  |  | 20.2
Financial assets | 49.3 |  |  |  |  |  |  |  | 49.3 |  |  |  | 52.8
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 2.6 |  |  |  |  |  |  |  | 2.6 |  |  |  | 7.8
Commodity derivatives | 32.6 |  |  |  |  |  |  |  | 32.6 |  |  |  | 23.6
Financial liabilities | 35.2 |  |  |  |  |  |  |  | 35.2 |  |  |  | 31.4
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 0 |  |  |  |  |  |  |  | 0 |  |  |  | 0
Commodity derivatives | 4.1 |  |  |  |  |  |  |  | 4.1 |  |  |  | 3.9
Financial assets | 4.1 |  |  |  |  |  |  |  | 4.1 |  |  |  | 3.9
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 0 |  |  |  |  |  |  |  | 0 |  |  |  | 0
Commodity derivatives | 1.5 |  |  |  |  |  |  |  | 1.5 |  |  |  | 0.7
Financial liabilities | 1.5 |  |  |  |  |  |  |  | 1.5 |  |  |  | 0.7
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Financial asset (liability) balance, net, beginning of period | 7.7 |  | 3.2 |  | (0.6) |  | (1.5) |  | 3.2 |  | (1.5) |  |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | (3.3) | [1] | 4.6 | [1] | (0.2) | [1] | (0.6) | [1] |  |  |  |  |
Settlements | (1.8) |  | (0.1) |  | 0.6 |  | 1.5 |  |  |  |  |  |
Financial asset (liability) balance, net, end of period | 2.6 | [2] | 7.7 |  | (0.2) | [2] | (0.6) |  | 2.6 | [2] | (0.2) | [2] |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities | $ (5.0) |  |  |  | $ 0.4 |  |  |  | $ (0.5) |  | $ 1.3 |  |
[1] | There were $5.0 million and $0.5 million of unrealized losses included in these amounts for the three and six months ended June 30, 2014, respectively. There were unrealized gains of $0.4 million and $1.3 million included in these amounts for the three and six months ended June 30, 2013, respectively.
[2] | There were no transfers into or out of Level 3 during the three or six months ended June 30, 2014 and 2013.

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