Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Name:	us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Pension Benefits and Postretirement Benefits Other Than Pensions (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncash settlement charge		$ 70.2
Noncash settlement charge, after tax		$ 55.5
Net assets of pension plan			$ 17.8	$ 16.4
Settlement adjustment	$ 2.7