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Financial Derivative Instruments - Fuel Hedging (Details) gal in Millions	Sep. 30, 2019 gal	[1]
Remainder of Current Year
Volume of Fuel Hedging
Fuel Hedged (in gallons)	344
2020
Volume of Fuel Hedging
Fuel Hedged (in gallons)	1,301
2021
Volume of Fuel Hedging
Fuel Hedged (in gallons)	1,169
2022
Volume of Fuel Hedging
Fuel Hedged (in gallons)	552
[1] Due to the types of derivatives utilized by the Company and different price levels of those contracts, these volumes represent the maximum economic hedge in place.

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Nominal number of units used to calculate payment on derivative.

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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=109980867&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=109980867&loc=SL5579245-113959

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