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Derivative Instruments, Hedging Activities and Fair Value Measurements, Derivative Fair Value Amounts (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Commodity derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | $ 52.1 | $ 61.6
Liability Derivatives | 87.1 | 45.5
Derivatives designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 84.2 | 90.5
Liability Derivatives | 78.3 | 211.3
Derivatives designated as hedging instruments [Member] | Interest rate derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 38.4 | 45.2
Liability Derivatives | 0 | 175.4
Derivatives designated as hedging instruments [Member] | Interest rate derivatives [Member] | Other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 16.1 | 19.6
Derivatives designated as hedging instruments [Member] | Interest rate derivatives [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 22.3 | 25.6
Derivatives designated as hedging instruments [Member] | Interest rate derivatives [Member] | Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 0 | 175.4
Derivatives designated as hedging instruments [Member] | Interest rate derivatives [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 0 | 0
Derivatives designated as hedging instruments [Member] | Commodity derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 45.8 | 45.3
Liability Derivatives | 78.3 | 35.9
Derivatives designated as hedging instruments [Member] | Commodity derivatives [Member] | Other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 45.8 | 45.3
Derivatives designated as hedging instruments [Member] | Commodity derivatives [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 0 | 0
Derivatives designated as hedging instruments [Member] | Commodity derivatives [Member] | Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 78.3 | 35.4
Derivatives designated as hedging instruments [Member] | Commodity derivatives [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 0 | 0.5
Derivatives not designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 6.3 | 16.3
Liability Derivatives | 23.5 | 26.8
Derivatives not designated as hedging instruments [Member] | Interest rate derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 0 | 0
Liability Derivatives | 14.7 | 17.2
Derivatives not designated as hedging instruments [Member] | Interest rate derivatives [Member] | Other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 0 | 0
Derivatives not designated as hedging instruments [Member] | Interest rate derivatives [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 0 | 0
Derivatives not designated as hedging instruments [Member] | Interest rate derivatives [Member] | Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 12.1 | 12.2
Derivatives not designated as hedging instruments [Member] | Interest rate derivatives [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 2.6 | 5.0
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 6.3 | 16.3
Liability Derivatives | 8.8 | 9.6
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 6.0 | 15.7
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 0.3 | 0.6
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 7.8 | 8.9
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | $ 1.0 | $ 0.7

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- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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