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Fair Value Measurements and Derivative Instruments (Fuel Price Risk) (Details) - Fuel Price Risk $ in Millions | Dec. 31, 2017 USD ($) T | Dec. 31, 2016 USD ($) T
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Derivative instruments disclosure |  |
Estimated unrealized net gains associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from other accumulated comprehensive income (loss) | $ | $ (23.7) | $ 138.5
2017 |  |
Derivative instruments disclosure |  |
Fuel Swap Agreements (metric tons) | 0 | 799,065
Percentage of projected requirements | 0.00% | 60.00%
2018 |  |
Derivative instruments disclosure |  |
Fuel Swap Agreements (metric tons) | 673,700 | 616,300
Percentage of projected requirements | 50.00% | 44.00%
2019 |  |
Derivative instruments disclosure |  |
Fuel Swap Agreements (metric tons) | 668,500 | 521,000
Percentage of projected requirements | 46.00% | 35.00%
2020 |  |
Derivative instruments disclosure |  |
Fuel Swap Agreements (metric tons) | 531,200 | 306,500
Percentage of projected requirements | 36.00% | 20.00%
2021 |  |
Derivative instruments disclosure |  |
Fuel Swap Agreements (metric tons) | 224,900 | 0
Percentage of projected requirements | 14.00% | 0.00%

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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