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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Plans [Member]
Pension Plan and Restoration of Retirement Income Plan:
Amortization of prior service cost, net of tax $0.0, $0.1, $0.0 and $0.1	$ 0.0	$ 0.1	$ 0.0	$ 0.1
Amortization of deferred net loss, net of tax of $0.0, $0.1, $0.0 and $0.1, respectively	0.1	0.0	0.2	0.3
Settlement cost, net of tax of $0.0, $0.5, $0.3 and $2.9, respectively	0.0	0.5	0.3	2.9
Other Postretirement Benefits Plan [Member]
Postretirement plans:
Amortization of prior service credit, net of tax ($0.0), ($0.1), ($0.0) and ($0.1)	0.0	(0.1)	0.0	(0.1)
Amortization of deferred net gain, net of tax of $0.1, $0.0, $0.1 and $0.0, respectively	$ 0.1	$ 0.0	$ 0.1	$ 0.0

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-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
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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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