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Fair Value Measurements and Derivative Instruments - Schedule of Outstanding Fuel Swap Agreements (Details) - Fuel Swap Agreements - metricTon
Mar. 31, 2026
Dec. 31, 2025
2026    
Derivative Instruments    
Fuel swap agreements (metric tons) 779,500 1,065,500
Percentage of projected requirements 59.00% 60.00%
2027    
Derivative Instruments    
Fuel swap agreements (metric tons) 875,048 819,048
Percentage of projected requirements 49.00% 47.00%
2028    
Derivative Instruments    
Fuel swap agreements (metric tons) 545,599 465,699
Percentage of projected requirements 30.00% 26.00%
2029    
Derivative Instruments    
Fuel swap agreements (metric tons) 281,400 0
Percentage of projected requirements 15.00% 0.00%