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Goodwill and intangible assets - Intangible Assets, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Gross Carrying Amount $ 65.5 $ 65.5
Accumulated Amortization 30.0 22.8
Net Carrying Amount 35.5 42.7
Technology    
Goodwill [Line Items]    
Gross Carrying Amount 10.0 10.0
Accumulated Amortization 10.0 8.1
Net Carrying Amount 0.0 1.9
Customer relationships    
Goodwill [Line Items]    
Gross Carrying Amount 54.2 54.2
Accumulated Amortization 19.0 14.1
Net Carrying Amount 35.2 40.1
Marketing    
Goodwill [Line Items]    
Gross Carrying Amount 1.3 1.3
Accumulated Amortization 1.0 0.6
Net Carrying Amount $ 0.3 $ 0.7