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Regulatory and Rate Matters - TNMP Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 25, 2024
May 26, 2023
Dec. 31, 2023
Feb. 28, 2023
Feb. 28, 2022
Feb. 28, 2021
Subsequent Event            
Public Utilities, General Disclosures [Line Items]            
Requested increase annual distribution revenue requirement $ 13.1          
Incremental distribution investments $ 97.4          
TNMP            
Public Utilities, General Disclosures [Line Items]            
Regulatory disallowance     $ 1.2      
TNMP | Energy efficiency costs            
Public Utilities, General Disclosures [Line Items]            
Aggregate collection amount   $ 6.6   $ 7.3 $ 7.2 $ 5.9
Performance bonus   $ 1.2   $ 1.9 $ 2.3 $ 1.0