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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
SEGMENT INFORMATION |  |  |  |
Stock-based compensation expense | $ 18.8 | $ 18.6 | $ 41.3 | $ 34.6
Corporate and unallocated |  |  |  |
SEGMENT INFORMATION |  |  |  |
Payroll costs | 87.5 | 82.6 | 186.1 | 162.9
Stock-based compensation expense | 17.8 | 18.1 | 39.7 | 33.8
Professional service expenses | 14.5 | 25.3 | 34.5 | 47.4
Other operating expenses | $ 23.6 | $ 16.4 | $ 48.1 | $ 34.4

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