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Goodwill and intangible assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 315.0	$ 108.6	$ 110.4
Amortization expense	3.0	0.0	0.0
Other
Goodwill [Line Items]
Goodwill	$ 10.3	$ 10.3	$ 12.1

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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