Goodwill and intangible assets - Intangible Assets, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Gross Carrying Amount	$ 65.5	$ 65.5
Accumulated Amortization	22.8	13.1
Total	42.7	52.4
Technology
Goodwill [Line Items]
Gross Carrying Amount	10.0	10.0
Accumulated Amortization	8.1	4.9
Total	1.9	5.1
Customer relationships
Goodwill [Line Items]
Gross Carrying Amount	54.2	54.2
Accumulated Amortization	14.1	7.9
Total	40.1	46.3
Customer relationships | CompuGain
Goodwill [Line Items]
Measurement period adjustments, increase in fair value of intangibles	27.6
Marketing
Goodwill [Line Items]
Gross Carrying Amount	1.3	1.3
Accumulated Amortization	0.6	0.3
Total	$ 0.7	$ 1.0