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Goodwill and intangible assets - Carrying Value of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance	$ 287.1	$ 315.0
Acquisition - Measurement period adjustments		(27.5)
Translation adjustments	0.3	(0.4)
Ending balance	287.4	287.1
Decrease in goodwill		27.5
DWS
Goodwill [Roll Forward]
Beginning balance	140.5	140.9
Acquisition - Measurement period adjustments		0.0
Translation adjustments	0.3	(0.4)
Ending balance	140.8	140.5
Decrease in goodwill		0.0
CA&I Segment
Goodwill [Roll Forward]
Beginning balance	38.0	65.5
Acquisition - Measurement period adjustments		(27.5)
Translation adjustments	0.0	0.0
Ending balance	38.0	38.0
Decrease in goodwill		27.5
ECS
Goodwill [Roll Forward]
Beginning balance	98.3	98.3
Acquisition - Measurement period adjustments		0.0
Translation adjustments	0.0	0.0
Ending balance	98.3	98.3
Decrease in goodwill		0.0
Other
Goodwill [Roll Forward]
Beginning balance	10.3	10.3
Acquisition - Measurement period adjustments		0.0
Translation adjustments	0.0	0.0
Ending balance	$ 10.3	10.3
Decrease in goodwill		$ 0.0

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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