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Commitments and contingencies (Details)
gal in Millions, $ in Millions
3 Months Ended
Mar. 31, 2025
USD ($)
gal
Mar. 31, 2024
Dec. 31, 2024
USD ($)
Contingencies      
Percentage of consolidated revenue from Cayman Water retail operations 28.00% 22.00%  
Percentage of consolidated gross profit from Cayman Water retail operations 46.00% 37.00%  
Percentage of revenue collected paid 7.50%    
Percentage of delinquent account receivables 78.00%   81.00%
CW-Bahamas      
Contingencies      
Accounts receivable | $ $ 25.5   $ 28.4
Blue Hills Water Works Plant | CW-Bahamas      
Contingencies      
Gallons of water delivered per week 63.0    
Windsor Water Plant | CW-Bahamas      
Contingencies      
Gallons of water delivered per week 16.8