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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Total gains (losses) included in: |  |  |  |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities | $ 29.5 |  | $ 25.7 |  | $ (21.6)
Liability commodity derivatives - Crude oil [Member] | Level 3 [Member] |  |  |  |  |
Financial liabilities [Abstract] |  |  |  |  |
Commodity derivatives | 3.9 |  |  |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |
Liability commodity derivatives | 3.9 |  |  |  |
Asset commodity derivatives - Crude oil [Member] | Level 3 [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Commodity derivatives | 2.4 |  |  |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |
Asset commodity derivatives | 2.4 |  |  |  |
Asset commodity derivatives - Crude oil [Member] | Liability commodity derivatives - Crude oil [Member] | Level 3 [Member] |  |  |  |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |
Fair Value Measurements, Valuation Techniques | Discounted cash flow |  |  |  |
Input description | Forward commodity prices |  |  |  |
Asset commodity derivatives - Crude oil [Member] | Liability commodity derivatives - Crude oil [Member] | Level 3 [Member] | Minimum [Member] |  |  |  |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |
Fair value inputs, forward commodity price (in dollars per unit) | 75.62 |  |  |  |
Asset commodity derivatives - Crude oil [Member] | Liability commodity derivatives - Crude oil [Member] | Level 3 [Member] | Maximum [Member] |  |  |  |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |
Fair value inputs, forward commodity price (in dollars per unit) | 92.28 |  |  |  |
Level 3 [Member] |  |  |  |  |
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward] |  |  |  |  |
Balance, beginning of period | 0.4 |  | (25.9) |  |
Total gains (losses) included in: |  |  |  |  |
Net income | (2.9) | [1] | 2.3 | [1] |
Other comprehensive income (loss) | 10.1 |  | 16.2 |  |
Settlements | 0.8 |  | (2.0) |  |
Transfers out of Level 3 | (9.9) | [2] | 9.8 | [2] |
Balance, end of period | (1.5) |  | 0.4 |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities | (1.9) |  | 2.6 |  |
Fair Value [Member] | Level 2 [Member] |  |  |  |  |
Financial Liabilities: [Abstract] |  |  |  |  |
Fixed Rate Debt Principal Amount Fair Value Disclosure | 18,420 |  | 15,760 |  |
Carrying Value [Member] |  |  |  |  |
Financial Liabilities: [Abstract] |  |  |  |  |
Fixed Rate Debt Principal Amount Fair Value Disclosure | 16,180 |  | 14,330 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 45.2 |  | 87.9 |  |
Commodity derivatives | 61.6 |  | 67.3 |  |
Financial assets | 106.8 |  | 155.2 |  |
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 192.6 |  | 311.4 |  |
Commodity derivatives | 45.5 |  | 65.0 |  |
Financial liabilities | 238.1 |  | 376.4 |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |
Asset commodity derivatives | 61.6 |  | 67.3 |  |
Liability commodity derivatives | 45.5 |  | 65.0 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  | 0 |  |
Commodity derivatives | 11.4 |  | 28.4 |  |
Financial assets | 11.4 |  | 28.4 |  |
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  | 0 |  |
Commodity derivatives | 13.1 |  | 29.9 |  |
Financial liabilities | 13.1 |  | 29.9 |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |
Asset commodity derivatives | 11.4 |  | 28.4 |  |
Liability commodity derivatives | 13.1 |  | 29.9 |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 45.2 |  | 87.9 |  |
Commodity derivatives | 47.8 |  | 38.1 |  |
Financial assets | 93.0 |  | 126.0 |  |
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 192.6 |  | 311.4 |  |
Commodity derivatives | 28.5 |  | 34.7 |  |
Financial liabilities | 221.1 |  | 346.1 |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |
Asset commodity derivatives | 47.8 |  | 38.1 |  |
Liability commodity derivatives | 28.5 |  | 34.7 |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  | 0 |  |
Commodity derivatives | 2.4 |  | 0.8 |  |
Financial assets | 2.4 |  | 0.8 |  |
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  | 0 |  |
Commodity derivatives | 3.9 |  | 0.4 |  |
Financial liabilities | 3.9 |  | 0.4 |  |
Fair Value Measurements, Recurring, Valuation Techniques [Line Items] |  |  |  |  |
Asset commodity derivatives | 2.4 |  | 0.8 |  |
Liability commodity derivatives | $ 3.9 |  | $ 0.4 |  |
[1] | There were $1.9 million of unrealized losses and $2.6 million of unrealized gains included in these amounts for the years ended December 31, 2012 and 2011, respectively.
[2] | Transfers out of Level 3 into Level 2 during 2012 were due to shorter remaining transaction maturities falling inside of the Level 2 range during the fourth quarter. Transfers out of Level 3 into Level 2 during 2011 were primarily due to the change in observability of forward NGL prices.

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