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Disclosures About Derivative Instruments and Hedging Activities (Details 1) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Liability, Fair Value, Net | $ 43.2 | $ 121.1
Derivative Asset, Fair Value, Net | 53.8 | 11.4
Designated as Hedging Instrument [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Liability, Fair Value, Net | 38.5 | 103.5
Derivative Asset, Fair Value, Net | 41.3 | 7.7
Derivative Financial Instruments and Other Assets [Member] | Designated as Hedging Instrument [Member] | Commodity Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Asset, Fair Value, Net | 40.9 | 3.5
Derivative Financial Instruments and Other Assets [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Asset, Fair Value, Net | 0.4 |
Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Liability, Fair Value, Net | 7.2 |
Derivative Financial Instruments and Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member] | Commodity Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Liability, Fair Value, Net |  | 29.3
Derivative Financial Instruments and Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Liability, Fair Value, Net |  | 2.4
Derivative Financial Instruments and Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Liability, Fair Value, Net | 29.2 | 71.8
Derivative Financial Instruments and Other Noncurrent Liabilities [Member] | Derivatives Subject to Utility Rate Regulation [Member] | Commodity Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Liability, Fair Value, Net | 3.3 | 9.0
Derivative Financial Instruments [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Asset, Fair Value, Net |  | 4.2
Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Commodity Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Asset, Fair Value, Net | 10.6 | 3.3
Derivative Financial Instruments [Member] | Derivatives Subject to Utility Rate Regulation [Member] | Commodity Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Asset, Fair Value, Net | 1.9 | 0.4
Derivative Financial Instruments, Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Commodity Contracts [Member] |  |
Balance sheet location and fair value of derivative assets and liabilities |  |
Derivative Liability, Fair Value, Net | $ 1.4 | $ 8.6

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- Definition Fair value of the gross assets less the gross liabilities of a derivative asset or group of derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Definition Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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