Other income, net - Schedule of Components of Other Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Interest income and other:
Interest and dividends	$ 4.3	$ 5.5
Securities transactions, net		0.2
Total	4.3	5.7
Currency transactions, net	(4.3)	5.8
Other, net	0.8	0.7
Total	$ 0.8	$ 12.2