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General and administrative expenses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
General and administrative expenses      
Salaries and related expenses $ 238.8 $ 193.0 $ 115.3
Office equipment and maintenance 22.1 15.1 11.6
Depreciation and amortization 26.0 22.9 22.5
Consulting, legal fees and insurance 22.4 19.9 4.1
Travel and vehicle expenses 5.7 2.0 1.7
Other 23.3 14.8 8.0
Total general and administrative expenses $ 338.3 $ 267.7 $ 163.2