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Goodwill and intangible assets - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]      
Accumulated goodwill impairment loss $ 39,100,000 $ 0  
Goodwill 247,900,000 287,400,000 $ 287,100,000
Amortization expense 7,200,000 9,700,000 10,100,000
Other      
Goodwill [Line Items]      
Goodwill $ 10,300,000 $ 10,300,000 $ 10,300,000