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Commitments and contingencies (Details)
gal in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
gal
Jun. 30, 2024
Jun. 30, 2025
USD ($)
gal
Jun. 30, 2024
Dec. 31, 2024
USD ($)
Contingencies          
Percentage of consolidated revenue from Cayman Water retail operations 26.00% 25.00% 27.00% 23.00%  
Percentage of consolidated gross profit from Cayman Water retail operations 38.00% 39.00% 42.00% 38.00%  
Percentage of revenue collected paid 7.50%   7.50%    
Percentage of delinquent account receivables 81.00%   81.00%   81.00%
CW-Bahamas          
Contingencies          
Accounts receivable | $ $ 29.3   $ 29.3   $ 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