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Commitments and contingencies (Details)
gal in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
gal
Sep. 30, 2024
Sep. 30, 2025
USD ($)
gal
Sep. 30, 2024
Dec. 31, 2024
USD ($)
Contingencies          
Percentage of consolidated revenue from Cayman Water retail operations 22.00% 23.00% 25.00% 23.00%  
Percentage of consolidated gross profit from Cayman Water retail operations 33.00% 34.00% 39.00% 36.00%  
Percentage of revenue collected paid 7.50%   7.50%    
Percentage of delinquent account receivables 66.00%   66.00%   81.00%
CW-Bahamas          
Contingencies          
Accounts receivable | $ $ 16.8   $ 16.8   $ 28.4
Blue Hills Water Works Plant | CW-Bahamas          
Contingencies          
Gallons of water delivered per week 63.0   63.0    
Windsor Water Plant | CW-Bahamas          
Contingencies          
Gallons of water delivered per week 16.8   16.8