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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

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