Discontinuation Of Cash Flow Hedge, Nonmonetary Amount

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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

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Nominal number of units 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
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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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.

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- Definition

Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from discontinuance of cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994

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Fair Value Measurements and Derivative Instruments - Fuel Price Risk (Details) - Fuel Swap Agreements $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) T t	Mar. 31, 2020 USD ($) T	Dec. 31, 2020 T t
Derivative Instruments
Discontinued cash flow hedge, nonmonetary amount	48,000	212,000
Estimated unrealized net loss associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from accumulated other comprehensive income loss \| $	$ 8.9
Other income (expense)
Derivative Instruments
Reclassification \| $	$ 4.4	$ 54.9
2021
Derivative Instruments
Fuel Swap Agreements (metric tons)	284,050		385,050
Percentage of projected requirements	43.00%		40.00%
2021 \| Not Designated as Hedging Instrument
Derivative Instruments
Fuel Swap Agreements (metric tons) \| t	172,400		229,850
2022
Derivative Instruments
Fuel Swap Agreements (metric tons)	389,650		389,650
Percentage of projected requirements	25.00%		23.00%
2022 \| Not Designated as Hedging Instrument
Derivative Instruments
Fuel Swap Agreements (metric tons) \| t	14,650		14,650
2023
Derivative Instruments
Fuel Swap Agreements (metric tons)	82,400		82,400
Percentage of projected requirements	5.00%		5.00%