Other (expense), net (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Intercompany Foreign Currency Balance [Line Items]
Postretirement expense	$ (21.6)	$ (12.1)	$ (43.1)	$ (158.3)
Loss on debt extinguishment	(6.8)	0.0	(6.8)	0.0
Foreign exchange gains (losses)	1.0	2.3	2.3	(12.6)
Other, net	5.3	0.4	8.6	19.4
Total other (expense), net	(22.1)	(9.4)	(39.0)	(151.5)
Net gain related to favorable judgement				14.9
Liquidation of Foreign Subsidiaries
Intercompany Foreign Currency Balance [Line Items]
Foreign exchange gains (losses)	$ 1.6	$ (1.2)	2.7	(1.7)
Pension Plans
Intercompany Foreign Currency Balance [Line Items]
Settlement losses to defined benefit pension plans			0.0	132.3
Pension Plans \| United States
Intercompany Foreign Currency Balance [Line Items]
Settlement losses to defined benefit pension plans			$ 0.0	$ 132.3

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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