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Goodwill and intangible assets - Carrying Value of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance		$ 287.4	$ 287.1
Goodwill impairment		(39.1)	0.0	$ 0.0
Translation adjustments		(0.4)	0.3
Ending balance		247.9	287.4	287.1
DWS
Goodwill [Roll Forward]
Beginning balance		140.8	140.5
Goodwill impairment	$ (39.1)	(39.1)
Translation adjustments		(0.4)	0.3
Ending balance		101.3	140.8	140.5
CA&I
Goodwill [Roll Forward]
Beginning balance		54.5	54.5
Goodwill impairment		0.0
Translation adjustments		0.0	0.0
Ending balance		54.5	54.5	54.5
ECS
Goodwill [Roll Forward]
Beginning balance		92.1	92.1
Goodwill impairment		0.0
Translation adjustments		0.0	0.0
Ending balance		$ 92.1	$ 92.1	$ 92.1

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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