v3.26.1
Commitments and Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 29 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Loss Contingencies [Line Items]          
Proceeds from legal settlements         $ 36.1
PFAS Contamination Legal Settlements          
Loss Contingencies [Line Items]          
Proceeds from legal settlements $ 11.0   $ 11.0    
3M Company PFAS Litigation Settlement          
Loss Contingencies [Line Items]          
Proceeds from legal settlements   $ 6.4   $ 6.4  
Receivable period for noncurrent cash proceeds receivable form legal settlement 7 years   7 years   7 years
Legal settlement receivable $ 5.7   $ 5.7   $ 5.7
SJWC          
Loss Contingencies [Line Items]          
Proceeds from legal settlements         24.4
SJWC | PFAS Contamination Legal Settlements          
Loss Contingencies [Line Items]          
Proceeds from legal settlements 7.4   7.4    
SJWC | 3M Company PFAS Litigation Settlement          
Loss Contingencies [Line Items]          
Proceeds from legal settlements   4.4   4.4  
CWC          
Loss Contingencies [Line Items]          
Proceeds from legal settlements         11.1
CWC | PFAS Contamination Legal Settlements          
Loss Contingencies [Line Items]          
Proceeds from legal settlements 3.5   3.5    
CWC | 3M Company PFAS Litigation Settlement          
Loss Contingencies [Line Items]          
Proceeds from legal settlements   1.9   1.9  
MWC          
Loss Contingencies [Line Items]          
Proceeds from legal settlements         0.6
Settlement payable to contract operators 0.4   0.4   0.4
MWC | PFAS Contamination Legal Settlements          
Loss Contingencies [Line Items]          
Proceeds from legal settlements 0.1   0.1    
Settlement payable to contract operators $ 0.1   $ 0.1   $ 0.1
MWC | 3M Company PFAS Litigation Settlement          
Loss Contingencies [Line Items]          
Proceeds from legal settlements   0.1   0.1  
Settlement payable to contract operators   $ 0.1   $ 0.1