Regulation - Narrative (Details) - Texas - Winter Storm Uri incremental costs - Winter Storm Uri - USD ($) $ in Millions	3 Months Ended	12 Months Ended	28 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2024
Regulatory Asset [Line Items]
Regulatory asset, deferred costs			$ 32.4
Regulatory asset, recovered cost	$ 1.6	$ 22.0
Regulatory asset, deferred costs, remaining	8.8		8.8
Other current assets
Regulatory Asset [Line Items]
Regulatory asset, deferred costs, remaining	2.4		2.4
Deferred charges and other assets
Regulatory Asset [Line Items]
Regulatory asset, deferred costs, remaining	$ 6.4		$ 6.4