Fair Value Measurements and Derivatives (Detail Textuals) Metric_Ton in Millions, $ in Millions, € in Billions |
12 Months Ended | ||
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Dec. 31, 2017
USD ($)
Metric_Ton
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Dec. 31, 2017
EUR (€)
Metric_Ton
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Dec. 31, 2016
USD ($)
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||
| Fair value of long-term debt | $ 6,448.6 | $ 6,525.7 | |
| Fair value of long-term debt in excess of carrying value | $ 23.5 | $ 11.6 | |
| Fuel Swaps | |||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||
| Derivative maturing date | Dec. 31, 2020 | ||
| Projected fuel purchases | Metric_Ton | 1.2 | 1.2 | |
| Foreign currency forward contracts | |||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||
| Notional amount of derivatives | $ 2,300.0 | € 1.9 | |
| Interest rates swaps | |||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||
| Notional amount of derivatives | $ 218.6 |
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. No definition available.
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