Other (expense), net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Intercompany Foreign Currency Balance [Line Items]
Postretirement expense	$ (11.7)	$ (9.9)	$ (170.0)	$ (213.0)
Foreign exchange gains (losses)	2.1	1.6	(10.5)	2.1
Other, net	1.4	4.7	20.8	(6.3)
Total other (expense), net	(8.2)	(3.6)	(159.7)	(217.2)
Net gain related to favorable judgement			14.9
Liquidation of Foreign Subsidiaries
Intercompany Foreign Currency Balance [Line Items]
Foreign exchange gains (losses)	$ 0.7	$ (0.5)	(1.0)	2.9
Pension Plans
Intercompany Foreign Currency Balance [Line Items]
Settlement losses to defined benefit pension plans			$ 132.3	$ 183.2

Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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