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Regulatory and Rate Matters - TNMP Narrative (Details) - TNMP - USD ($)
$ in Millions
Apr. 20, 2023
Apr. 05, 2023
Jan. 23, 2023
Sep. 24, 2022
May 27, 2022
Mar. 01, 2022
Public Utilities, Commitments And Contingencies [Line Items]            
Requested increase in annual distribution revenue     $ 19.4      
Incremental distribution investments     $ 150.5      
Energy efficiency cost recovery, requested change amount         $ 1.9 $ 7.2
Energy efficiency cost recovery, requested bonus         $ 7.4 $ 2.3
Energy efficiency cost recovery factor, approved settlement amount       $ 7.3    
Energy efficiency cost recovery factor, approved performance bonus       $ 1.9    
Subsequent event            
Public Utilities, Commitments And Contingencies [Line Items]            
Requested increase in annual distribution revenue   $ 14.8        
Incremental distribution investments $ 157.0