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Defined benefit and 401(k) savings plan - Swiss Plan Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in Plan Assets:      
Fair value of plan assets, beginning of period $ 29.3 $ 29.3  
Employer contributions   1.5  
Employee contributions   0.9  
Net benefits received   3.4  
Actual return on plan assets   (0.4)  
Settlements   (5.0)  
Currency impact   (0.4)  
Fair value of plan assets, end of period   29.3 $ 29.3
Change in Benefit Obligation:      
Projected benefit obligation, beginning of period 37.2 46.8  
Service cost 0.7 1.9 2.4
Interest Cost $ 0.3 0.1 0.0
Employee contributions   0.9  
Actuarial gain   (10.0)  
Net benefits received   3.4  
Settlements   (5.0)  
Currency impact   (0.9)  
Projected benefit obligation, end of period   37.2 $ 46.8
Funded status, end of period   (7.9)  
Accumulated benefit obligation, end of period   $ 34.0