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Fair Value Measurements and Derivative Instruments - Fuel Price Risk (Details) - Fuel Swap Agreements
$ in Millions
Jun. 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 | $ $ 31.7 $ 7.9
2023    
Derivative Instruments    
Fuel Swap Agreements (metric tons) 448,100 825,651
Percentage of projected requirements 54.00% 50.00%
2024    
Derivative Instruments    
Fuel Swap Agreements (metric tons) 791,051 0
Percentage of projected requirements 45.00% 0.00%
2025    
Derivative Instruments    
Fuel Swap Agreements (metric tons) 456,000 0
Percentage of projected requirements 25.00% 0.00%