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Capitalized contract costs - Summary (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Capitalized Contract Cost [Line Items]      
Deferred commissions and costs to fulfill a contract - amortization expense $ 3.5 $ 6.7 $ 23.7
Costs to fulfill a contract 12.9 19.2  
Deferred Commissions      
Capitalized Contract Cost [Line Items]      
Deferred commissions 7.2 3.7  
Deferred commissions and costs to fulfill a contract - amortization expense $ 1.1 $ 1.5 $ 2.9