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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 |  | 3 Months Ended |  |  |  |  |  | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Liability commodity derivatives - Crude oil [Member] Level 3 [Member] | Mar. 31, 2013 Asset commodity derivatives - Crude oil [Member] Level 3 [Member] | Mar. 31, 2013 Asset commodity derivatives - Crude oil [Member] Liability commodity derivatives - Crude oil [Member] Level 3 [Member] | Mar. 31, 2013 Asset commodity derivatives - Crude oil [Member] Liability commodity derivatives - Crude oil [Member] Level 3 [Member] Minimum [Member] | Mar. 31, 2013 Asset commodity derivatives - Crude oil [Member] Liability commodity derivatives - Crude oil [Member] Level 3 [Member] Maximum [Member] | Mar. 31, 2013 Fair Value [Member] Level 2 [Member] | Dec. 31, 2012 Fair Value [Member] Level 2 [Member] | Mar. 31, 2013 Carrying Value [Member] Level 2 [Member] | Dec. 31, 2012 Carrying Value [Member] Level 2 [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 2 [Member] | Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member]
Financial assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  |  |  |  |  |  |  |  |  |  |  | $ 38.4 | $ 0 | $ 38.4 | $ 0 |  |  |
Commodity derivatives |  |  |  | 0 |  |  |  |  |  |  |  | 52.1 | 16.3 | 35.8 | 0 |  |  |
Financial assets |  |  |  |  |  |  |  |  |  |  |  | 90.5 | 16.3 | 74.2 | 0 |  |  |
Financial liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  |  |  |  |  |  |  |  |  |  |  | 14.7 | 0 | 14.7 | 0 |  |  |
Commodity derivatives |  |  | 0.6 |  |  |  |  |  |  |  |  | 87.1 | 39.1 | 47.4 | 0.6 |  |  |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  | 101.8 | 39.1 | 62.1 | 0.6 |  |  |
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.5) |  | 0.4 |
Total gains (losses) included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.6) | [1] | 0.5 | [1]
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0.5 |
Settlements |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.5 |  | (0.5) |
Balance, end of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.6) |  | 0.9 |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities | (12.3) | 15.4 |  |  |  |  |  |  |  |  |  |  |  |  | 0.9 |  | 0.1 |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset commodity derivatives |  |  |  | 0 |  |  |  |  |  |  |  | 52.1 | 16.3 | 35.8 | 0 |  |  |
Liability commodity derivatives |  |  | 0.6 |  |  |  |  |  |  |  |  | 87.1 | 39.1 | 47.4 | 0.6 |  |  |
Fair Value Measurements, Valuation Techniques |  |  |  |  | Discounted cash flow |  |  |  |  |  |  |  |  |  |  |  |  |
Input description |  |  |  |  | Forward commodity prices |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value inputs, forward commodity price (in dollars per unit) |  |  |  |  |  | 95.75 | 112.88 |  |  |  |  |  |  |  |  |  |  |
Financial Liabilities: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Rate Debt Principal Amount Fair Value Disclosure |  |  |  |  |  |  |  | $ 19,540 | $ 18,420 | $ 17,530 | $ 16,180 |  |  |  |  |  |  |
[1] | There were unrealized gains of $0.9 million and $0.1 million included in these amounts for the three months ended March 31, 2013 and 2012, respectively.

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