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Regulatory Matters (Details) - USD ($)
$ in Millions
Oct. 11, 2016
Sep. 01, 2016
Jul. 27, 2016
Service Stability Rider     $ 9.2
Revenue Reduction Per Month From Reverting Back to ESP 1   $ 3.0  
Subsidiaries [Member]      
Service Stability Rider     $ 9.2
Revenue Reduction Per Month From Reverting Back to ESP 1   $ 3.0  
Subsequent Event [Member]      
Distribution Modernization Rider $ 145.0    
Regulatory Assets, Renewable Energy Recovery 10.5    
Subsequent Event [Member] | Subsidiaries [Member]      
Distribution Modernization Rider 145.0    
Regulatory Assets, Renewable Energy Recovery $ 10.5