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Capitalized contract costs - Summary (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Capitalized Contract Cost [Line Items]      
Costs to fulfill a contract - amortization expense $ 23.7 $ 27.9 $ 27.5
Costs to fulfill a contract 34.8 56.2  
Deferred Commissions      
Capitalized Contract Cost [Line Items]      
Deferred commissions 4.9 6.7  
Costs to fulfill a contract - amortization expense $ 2.9 $ 2.9 $ 3.2