Other (expense), net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Intercompany Foreign Currency Balance [Line Items]
Postretirement expense	$ (9.7)	$ (167.7)
Foreign exchange gains (losses)	2.2	(2.9)
Environmental costs and other, net	(13.5)	(12.0)
Total other (expense), net	(21.0)	(182.6)
Liquidation of Foreign Subsidiaries
Intercompany Foreign Currency Balance [Line Items]
Foreign exchange gains (losses)	(1.1)	(2.3)
Pension Plans
Intercompany Foreign Currency Balance [Line Items]
Settlement losses	$ 0.0	$ 158.0