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Financial risk management - Credit risk (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Disclosure of credit risk exposure [line items]  
Total Outstanding $ 1,531.2
Amount of credit to customers guaranteed by credit insurance $ 232.3
Weighted average duration of invetsment in debt instruments 2 years 2 months 12 days
AA- to AAA  
Disclosure of credit risk exposure [line items]  
Total Outstanding $ 986.9
A- to A+  
Disclosure of credit risk exposure [line items]  
Total Outstanding 295.6
BBB- to BBB+  
Disclosure of credit risk exposure [line items]  
Total Outstanding $ 248.7