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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pension Plans [Member]
Pension Plan and Restoration of Retirement Income Plan:
Amortization of prior service cost, net of tax of $0.0, $0.0, $0.1 and $0.0, respectively	$ 0.0	$ 0.0	$ 0.1	$ 0.0
Amortization of deferred net loss, net of tax of $0.0, $0.0, $0.0 and $0.1, respectively	0.0	0.0	0.0	0.1
Regulatory classification of certain pension costs, net of tax of $0.0, $0.0, $0.0 and $1.2, respectively	0.0	0.0	0.0	1.2
Other Postretirement Benefits Plan [Member]
Postretirement plans:
Amortization of deferred net gain, net of tax of $(0.0), $(0.0), $(0.1) and $(0.0), respectively	$ 0.0	$ 0.0	$ (0.1)	$ 0.0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-12

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