Fair Value Measurements and Derivative Instruments - Fuel Price Risk (Details) - Fuel Swap Agreements $ in Millions	Sep. 30, 2020 USD ($) t	Dec. 31, 2019 t
Derivative Instruments
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 \| $	$ (48.1)
2020
Derivative Instruments
Percentage of projected requirements	53.00%	52.00%
2020 \| Designated as Hedging Instrument
Derivative Instruments
Fuel Swap Agreements (metric tons)	60,800	792,900
2020 \| Not Designated as Hedging Instrument
Derivative Instruments
Fuel Swap Agreements (metric tons)	113,700	37,600
2021
Derivative Instruments
Percentage of projected requirements	39.00%	30.00%
2021 \| Designated as Hedging Instrument
Derivative Instruments
Fuel Swap Agreements (metric tons)	518,450	488,900
2021 \| Not Designated as Hedging Instrument
Derivative Instruments
Fuel Swap Agreements (metric tons)	96,450	0
2022
Derivative Instruments
Percentage of projected requirements	24.00%	19.00%
2022 \| Designated as Hedging Instrument
Derivative Instruments
Fuel Swap Agreements (metric tons)	404,300	322,900
2023
Derivative Instruments
Percentage of projected requirements	5.00%	5.00%
2023 \| Designated as Hedging Instrument
Derivative Instruments
Fuel Swap Agreements (metric tons)	82,400	82,400

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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)
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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.

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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

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-Publisher FASB
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-Topic 815
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-Section 50
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