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Summary of significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2024
Summary of significant accounting policies [Abstract]  
Estimated Useful Life of Equipment The estimated useful life of equipment is as follows:

 
Estimated
useful life in
years
Building and facilities
20 and 25
Maritime and transportation equipment
4, 5 and 10
Major repairs
2.5
Other equipment
Various