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Regulatory and Rate Matters - TNMP Narrative (Details) - TNMP customer in Thousands, $ in Millions			9 Months Ended
	Jul. 08, 2024 customer	Sep. 28, 2023 USD ($)	Sep. 30, 2024 USD ($)	Oct. 24, 2024 USD ($)	Aug. 28, 2024 USD ($)	Mar. 01, 2022 USD ($)
Public Utilities, Commitments And Contingencies [Line Items]
Energy efficiency cost recovery, requested change amount						$ 7.3
Energy efficiency cost recovery, requested bonus						$ 1.9
Energy efficiency cost recovery factor, recovery		$ 6.6
Energy efficiency cost recovery factor, approved performance bonus		$ 1.2
System Resiliency Plan
Public Utilities, Commitments And Contingencies [Line Items]
Capital investment					$ 600.0
Cost related to investment					$ 151.0
Hurricane
Public Utilities, Commitments And Contingencies [Line Items]
Number of customers without power | customer	116
Incurred cost without power due to natural disaster			$ 47.2
Hurricane | Public Utilities, Property, Plant and Equipment, Plant in Service
Public Utilities, Commitments And Contingencies [Line Items]
Incurred cost without power due to natural disaster			28.6
Hurricane | Other Deferred Charges
Public Utilities, Commitments And Contingencies [Line Items]
Incurred cost without power due to natural disaster			$ 18.6
Subsequent Event
Public Utilities, Commitments And Contingencies [Line Items]
Energy efficiency cost recovery, requested bonus				$ 7.0
Energy efficiency cost recovery factor, approved performance bonus				$ 1.3

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