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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 | 9 Months Ended |
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Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.3 |  | $ 15.9 |
Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivatives | 2.3 |  |  |  |  |  |  |  |  |  |  |  | 2.3 |  |  |
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivatives | 2.2 |  |  |  |  |  |  |  |  |  |  |  | 2.2 |  |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 31.4 |  |  |  |  |  |  |  |  |  |  |  | 31.4 |  |  | 45.2
Commodity derivatives | 69.5 |  |  |  |  |  |  |  |  |  |  |  | 69.5 |  |  | 61.6
Financial assets | 100.9 |  |  |  |  |  |  |  |  |  |  |  | 100.9 |  |  | 106.8
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 10.3 |  |  |  |  |  |  |  |  |  |  |  | 10.3 |  |  | 192.6
Commodity derivatives | 51.9 |  |  |  |  |  |  |  |  |  |  |  | 51.9 |  |  | 45.5
Financial liabilities | 62.2 |  |  |  |  |  |  |  |  |  |  |  | 62.2 |  |  | 238.1
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0
Commodity derivatives | 34.0 |  |  |  |  |  |  |  |  |  |  |  | 34.0 |  |  | 11.4
Financial assets | 34.0 |  |  |  |  |  |  |  |  |  |  |  | 34.0 |  |  | 11.4
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0
Commodity derivatives | 19.5 |  |  |  |  |  |  |  |  |  |  |  | 19.5 |  |  | 13.1
Financial liabilities | 19.5 |  |  |  |  |  |  |  |  |  |  |  | 19.5 |  |  | 13.1
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 31.4 |  |  |  |  |  |  |  |  |  |  |  | 31.4 |  |  | 45.2
Commodity derivatives | 33.2 |  |  |  |  |  |  |  |  |  |  |  | 33.2 |  |  | 47.8
Financial assets | 64.6 |  |  |  |  |  |  |  |  |  |  |  | 64.6 |  |  | 93.0
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 10.3 |  |  |  |  |  |  |  |  |  |  |  | 10.3 |  |  | 192.6
Commodity derivatives | 30.2 |  |  |  |  |  |  |  |  |  |  |  | 30.2 |  |  | 28.5
Financial liabilities | 40.5 |  |  |  |  |  |  |  |  |  |  |  | 40.5 |  |  | 221.1
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0
Commodity derivatives | 2.3 |  |  |  |  |  |  |  |  |  |  |  | 2.3 |  |  | 2.4
Financial assets | 2.3 |  |  |  |  |  |  |  |  |  |  |  | 2.3 |  |  | 2.4
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0
Commodity derivatives | 2.2 |  |  |  |  |  |  |  |  |  |  |  | 2.2 |  |  | 3.9
Financial liabilities | 2.2 |  |  |  |  |  |  |  |  |  |  |  | 2.2 |  |  | 3.9
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial asset (liability) balance, net, beginning of period | (0.2) |  | (0.6) |  | (1.5) |  | 4.9 |  | 0.9 |  | 0.4 |  | (1.5) |  | 0.4 |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1.1 | [1] | (0.2) | [1] | (0.6) | [1] | (0.6) | [1] | (1.3) | [1] | 0.5 | [1] |  |  |  |
Other comprehensive income (loss) | (0.9) |  | 0 |  | 0 |  | 3.5 |  | 6.0 |  | 0.5 |  |  |  |  |
Settlements | 0.1 |  | 0.6 |  | 1.5 |  | 1.4 |  | (0.7) |  | (0.5) |  |  |  |  |
Financial asset (liability) balance, net, end of period | 0.1 | [2] | (0.2) |  | (0.6) |  | 9.2 |  | 4.9 |  | 0.9 |  | 0.1 | [2] | 9.2 |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities | $ 1.1 |  |  |  |  |  | $ 0.8 |  |  |  |  |  | $ 2.4 |  | $ (1.1) |
[1] | There were unrealized gains of $1.1 million and $2.4 million included in these amounts for the three and nine months ended September 30, 2013, respectively. There were $0.8 million of unrealized gains and $1.1 million of unrealized losses included in these amounts for the three and nine months ended September 30, 2012, respectively.
[2] | There were no transfers into or out of Level 3 during the three or nine months ended September 30, 2013.

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