Date the derivative contract matures, in YYYY-MM-DD format.

No definition available.

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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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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.

+ References

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.

+ References

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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.

+ References

No definition available.

+ Details

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Fair Value Measurements and Derivatives (Details) T in Thousands, € in Billions, $ in Billions	9 Months Ended
	Sep. 30, 2021 USD ($) T	Sep. 30, 2021 EUR (€) T	Dec. 31, 2020 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	$ 14.2
Fair value of long-term debt in excess of carrying value	$ 1.6		$ 2.2
Fuel contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative maturing date	Dec. 31, 2023
Projected fuel purchases \| T	366	366
Fuel contracts \| Dedesignated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative maturing date	Dec. 31, 2022
Projected fuel purchases \| T	153	153
Foreign currency contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	$ 2.7	€ 2.3
Interest rate swap
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	$ 0.2