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Derivative Instruments, Hedging Activities and Fair Value Measurements, Derivative Fair Value Amounts (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Interest rate derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | $ 0.1 | $ 36.5
Liability Derivatives | 1.7 | 1.1
Commodity derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 161.7 | 541.4
Liability Derivatives | 176.9 | 739.4
Derivatives designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 116.0 | 535.7
Liability Derivatives | 112.9 | 663.1
Derivatives designated as hedging instruments [Member] | Interest rate derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 0.1 | 36.5
Liability Derivatives | 1.7 | 1.1
Derivatives designated as hedging instruments [Member] | Interest rate derivatives [Member] | Current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 0.0 | 0.3
Derivatives designated as hedging instruments [Member] | Interest rate derivatives [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 0.1 | 36.2
Derivatives designated as hedging instruments [Member] | Interest rate derivatives [Member] | Current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 1.5 | 0.2
Derivatives designated as hedging instruments [Member] | Interest rate derivatives [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 0.2 | 0.9
Derivatives designated as hedging instruments [Member] | Commodity derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 115.9 | 499.2
Liability Derivatives | 111.2 | 662.0
Derivatives designated as hedging instruments [Member] | Commodity derivatives [Member] | Current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 109.5 | 499.2
Derivatives designated as hedging instruments [Member] | Commodity derivatives [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 6.4 | 0.0
Derivatives designated as hedging instruments [Member] | Commodity derivatives [Member] | Current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 104.4 | 662.0
Derivatives designated as hedging instruments [Member] | Commodity derivatives [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 6.8 | 0.0
Derivatives not designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 45.8 | 42.2
Liability Derivatives | 65.7 | 77.4
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 45.8 | 42.2
Liability Derivatives | 65.7 | 77.4
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 43.9 | 41.9
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives | 1.9 | 0.3
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 62.3 | 75.5
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | $ 3.4 | $ 1.9

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: 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=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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