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Personnel expenses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Salaries and related expenses included in:      
Operating expenses and cost of services $ 250.9 $ 218.3 $ 145.4
General and administrative 238.8 193.0 115.3
Total personnel expenses $ 489.7 $ 411.3 $ 260.7