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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Plans [Member]
Pension Plan and Restoration of Retirement Income Plan:
Amortization of prior service cost, net of tax of $0.1 and $0.0, respectively	$ 0.1	$ 0.0
Amortization of deferred net loss, net of tax of $0.0 and $0.1, respectively	0.0	0.1
Regulatory classification of certain pension costs, net of tax of $1.2 and $0.0, respectively	1.2	0.0
Settlement cost, net of tax of $0.0 and $0.2, respectively	0.0	0.2
Other Postretirement Benefits Plan [Member]
Postretirement plans:
Amortization of deferred net gain, net of tax of $0.0 and $0.0, respectively	$ 0.0	$ 0.0

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Amount of tax expense (benefit) for increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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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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