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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
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 $0.1, respectively	$ 0.0	$ 0.0	$ 0.1	$ 0.1
Amortization of deferred net loss, net of tax of $0.0, $0.0, $0.0 and $0.0, respectively	0.0	0.0	0.0	0.0
Other Postretirement Benefits Plan [Member]
Postretirement plans:
Amortization of deferred net gain, net of tax of $(0.0), $(0.0), $(0.0) and $(0.1), respectively	$ (0.0)	$ (0.0)	$ (0.0)	$ (0.1)

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for 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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