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SEGMENT INFORMATION - Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
SEGMENT INFORMATION        
Stock-based compensation expense $ 17.9 $ 16.6 $ 52.5 $ 49.2
Corporate and Unallocated        
SEGMENT INFORMATION        
Payroll costs 82.7 69.4 245.5 207.6
Stock-based compensation expense 17.4 16.2 51.1 48.5
Professional service expenses 27.3 26.0 74.7 69.3
Other operating expenses $ 25.4 $ 17.2 $ 59.9 $ 50.8