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SEGMENT INFORMATION - Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
SEGMENT INFORMATION        
Stock-based compensation expense $ 18.6 $ 16.3 $ 34.6 $ 32.6
Corporate and Unallocated        
SEGMENT INFORMATION        
Payroll costs 82.6 70.0 162.9 138.1
Stock-based compensation expense 18.1 16.0 33.8 32.2
Professional service expenses 25.3 16.9 47.4 43.3
Other operating expenses $ 16.4 $ 19.7 $ 34.4 $ 33.7