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Derivative Instruments - Effect on Income (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Gain (loss) on derivative |  |  |
Gains or (losses) recognized in income representing hedge ineffectiveness | $ (14,500,000) | $ 16,100,000 | $ (18,700,000)
Gains or (losses) that were excluded from the assessment of the effectiveness of fair value hedges | 0 | 0 | 0
Derivative, credit-risk related contingent features |  |  |
Net liability position | 15,200,000 | 63,200,000 |
Additional assets required to be posted should credit-risk contingent feature be triggered | 15,200,000 | 35,100,000 |
Collateral posted |  | 28,100,000 |
Derivatives designated as hedging instruments | Fair value hedges |  |  |
Gain (loss) on derivative |  |  |
Realized and Unrealized Gain (Loss) on Derivative Instruments | (25,300,000) | 86,800,000 | 132,200,000
Realized and Unrealized Gain (Loss) on Hedged Items | 10,800,000 | (70,700,000) | (150,900,000)
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | Revenue |  |  |
Gain (loss) on derivative |  |  |
Realized and Unrealized Gain (Loss) on Derivative Instruments | 0 | 49,300,000 | 0
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | Cost of revenue |  |  |
Gain (loss) on derivative |  |  |
Realized and Unrealized Gain (Loss) on Derivative Instruments | (25,300,000) | 37,500,000 | 132,200,000
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts for inventory hedging | Revenue |  |  |
Gain (loss) on derivative |  |  |
Realized and Unrealized Gain (Loss) on Hedged Items | 0 | 0 | 0
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts for inventory hedging | Cost of revenue |  |  |
Gain (loss) on derivative |  |  |
Realized and Unrealized Gain (Loss) on Hedged Items | 10,800,000 | (70,700,000) | (150,900,000)
Derivatives designated as hedging instruments | Cash flow hedges |  |  |
Gain (loss) on derivative |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) | 32,300,000 | 1,000,000 | 0
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) | 38,800,000 | 1,800,000 | 0
Amount of Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) | (4,400,000) | 10,800,000 | 0
Derivatives designated as hedging instruments | Cash flow hedges | Commodity contracts | Revenue |  |  |
Gain (loss) on derivative |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) | (145,800,000) | 106,500,000 | 0
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) | 18,100,000 | 7,200,000 | 0
Amount of Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) | (13,700,000) | 28,600,000 | 0
Derivatives designated as hedging instruments | Cash flow hedges | Commodity contracts | Cost of revenue |  |  |
Gain (loss) on derivative |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Effective Portion) | 178,100,000 | (105,400,000) | 0
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) | 20,800,000 | (5,300,000) | 0
Amount of Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) | 9,400,000 | (17,800,000) | 0
Derivatives not designated as hedging instruments |  |  |
Gain (loss) on derivative |  |  |
Amount of Realized and Unrealized Gain (Loss) | 7,300,000 | 46,300,000 | 83,600,000
Derivatives not designated as hedging instruments | Commodity contracts |  |  |
Gain (loss) on derivative |  |  |
Amount of Realized and Unrealized Gain (Loss) | (1,900,000) | 32,700,000 | 66,700,000
Derivatives not designated as hedging instruments | Commodity contracts | Revenue |  |  |
Gain (loss) on derivative |  |  |
Amount of Realized and Unrealized Gain (Loss) | 29,700,000 | 171,700,000 | 64,500,000
Derivatives not designated as hedging instruments | Commodity contracts | Cost of revenue |  |  |
Gain (loss) on derivative |  |  |
Amount of Realized and Unrealized Gain (Loss) | (31,600,000) | (139,000,000) | 2,200,000
Derivatives not designated as hedging instruments | Foreign currency contracts |  |  |
Gain (loss) on derivative |  |  |
Amount of Realized and Unrealized Gain (Loss) | 9,200,000 | 13,600,000 | 16,900,000
Derivatives not designated as hedging instruments | Foreign currency contracts | Revenue |  |  |
Gain (loss) on derivative |  |  |
Amount of Realized and Unrealized Gain (Loss) | 10,000,000 | 4,100,000 | 4,300,000
Derivatives not designated as hedging instruments | Foreign currency contracts | Other (expense) income, net |  |  |
Gain (loss) on derivative |  |  |
Amount of Realized and Unrealized Gain (Loss) | $ (800,000) | $ 9,500,000 | $ 12,600,000

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + Details
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- Definition Net gain (loss) relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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