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SEGMENT INFORMATION - Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
SEGMENT INFORMATION        
Stock-based compensation expense $ 18.8 $ 18.6 $ 41.3 $ 34.6
Corporate and unallocated        
SEGMENT INFORMATION        
Payroll costs 87.5 82.6 186.1 162.9
Stock-based compensation expense 17.8 18.1 39.7 33.8
Professional service expenses 14.5 25.3 34.5 47.4
Other operating expenses $ 23.6 $ 16.4 $ 48.1 $ 34.4