Fair Value Measurements and Derivative Instruments - Fuel Price Risk (Details) - Fuel Swap Agreements $ in Millions	Sep. 30, 2023 USD ($) T	Dec. 31, 2022 USD ($) T
Derivative Instruments
Estimated unrealized net gain (loss) associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from accumulated other comprehensive income loss \| $	$ 55.6	$ (7.9)
2023
Derivative Instruments
Fuel Swap Agreements (metric tons)	224,100	825,651
Percentage of projected requirements	54.00%	50.00%
2024
Derivative Instruments
Fuel Swap Agreements (metric tons)	1,054,501	0
Percentage of projected requirements	60.00%	0.00%
2025
Derivative Instruments
Fuel Swap Agreements (metric tons)	685,400	0
Percentage of projected requirements	39.00%	0.00%

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Nominal number of units used to calculate payment on derivative.

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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.

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