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SEGMENT INFORMATION - Expenses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
SEGMENT INFORMATION    
Stock-based compensation expense $ 22.5 $ 16.1
Corporate and unallocated    
SEGMENT INFORMATION    
Payroll costs 98.6 80.3
Stock-based compensation expense 22.0 15.7
Professional service expenses 20.0 22.1
Other operating expenses $ 24.5 $ 18.0