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Income taxes - Components of Comprehensive Provision for Income Taxes Allocation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income taxes
Expected tax expense (benefit) at U.S. federal statutory income tax rate of 21%	$ (1.6)	$ 25.2	$ 8.1	$ 36.9
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
Non-U.S. tax rates	$ (0.5)	$ 0.5	$ (0.3)	$ 0.4
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. tax group companies and other affiliates	(20.8)	4.5	(23.3)	0.2
Global intangible low-taxed income, net	(1.9)	1.5	0.6	2.9
Valuation allowance, net	17.7	1.3	23.2	3.8
Nondeductible expenses	5.1	0.5	6.4	1.1
Impact of tax rate change	19.3		19.3
U.S. state income tax expense (benefit), net	(2.5)	1.1	(2.7)	1.4
Other, net	(0.5)	(0.3)	(1.0)	(0.1)
Income tax expense	14.3	34.3	30.3	46.6
Comprehensive provision for income taxes allocable to:
Net income (loss)	14.3	34.3	30.3	46.6
Other comprehensive income (loss):
Currency translation		0.7	3.6	(1.4)
Pension plans	0.2	0.2	0.6	0.8
Other		0.2
Total	$ 14.5	$ 35.4	$ 34.5	$ 46.0

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