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Financial Instruments and Risk Management (Fuel Option Contracts Narrative) (Details) - Fuel Contract - Commodity price risk
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
$ / shares
$ / $
$ / $
Disclosure of detailed information about hedged items [line items]  
Financial liabilities, at fair value | $ $ 0.2
2024  
Disclosure of detailed information about hedged items [line items]  
Number of Gallons Subject to Contract | $ / shares 1,512,000
Top of range | 2024  
Disclosure of detailed information about hedged items [line items]  
Average rate of hedging instrument 271.00%
Bottom of range | 2024  
Disclosure of detailed information about hedged items [line items]  
Average rate of hedging instrument 250.00%