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Employee benefits - Plan assets composition (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Employee benefits    
Equity instruments $ 8.5 $ 9.4
Debt instruments 12.8 15.0
Cash and deposits 2.4 2.0
Other 3.1 4.7
Fair value of the plan assets $ 26.8 $ 31.1