Income taxes - Components of the Provisions for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current
Federal	$ 4.4	$ (0.6)	$ (9.4)
State	1.4	0.5	1.9
International	47.4	36.7	33.8
Total current	53.2	36.6	26.3
Deferred
Federal	(4.4)	(2.0)	(37.7)
State	0.0	(1.2)	(3.2)
International	(1.1)	(4.1)	7.2
Total deferred	(5.5)	(7.3)	(33.7)
Income tax (benefit) provision	$ 47.7	$ 29.3	$ (7.4)

Amount of current federal tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current national tax expense (benefit) for non-US (United States of America) jurisdiction.

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