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Commitments and Contingencies (Permanent Retirement of San Onofre) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 19, 2017
Loss Contingencies [Line Items]      
Regulatory assets $ 5,022.0 $ 4,914.0  
The Utilities | Settled | Revised San Onofre Settlement Agreement      
Loss Contingencies [Line Items]      
Settlement agreement funding $ 12.5    
The Utilities | San Onofre      
Loss Contingencies [Line Items]      
Proceeds received   72.0  
The Utilities | San Onofre | MHI Arbitration regulatory liability      
Loss Contingencies [Line Items]      
Proceeds received   $ 47.0  
The Utilities | San Onofre      
Loss Contingencies [Line Items]      
Regulatory assets     $ 775.0