Other (expense), net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Intercompany Foreign Currency Balance [Line Items]
Postretirement expense	$ (9.9)	$ (10.9)	$ (213.0)	$ (32.5)
Foreign exchange gains (losses)	1.6	(5.9)	2.1	(6.3)
Environmental costs and other, net	4.7	(6.5)	(6.3)	(27.4)
Total other (expense), net	(3.6)	(23.3)	(217.2)	(66.2)
Foreign exchange gains (losses)	1.6	(5.9)	2.1	(6.3)
Liquidation of Foreign Subsidiaries
Intercompany Foreign Currency Balance [Line Items]
Foreign exchange gains (losses)	(0.5)	(1.9)	2.9	(4.8)
Foreign exchange gains (losses)	$ (0.5)	$ (1.9)	2.9	(4.8)
Pension Plans
Intercompany Foreign Currency Balance [Line Items]
Settlement losses to defined benefit pension plans			$ 183.2	$ 0.0