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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

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