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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEGMENT INFORMATION |  |  |
Stock-based compensation expense | $ 68.8 | $ 64.1 | $ 70.5
Corporate and unallocated |  |  |
SEGMENT INFORMATION |  |  |
Payroll costs | 331.7 | 278.7 | 258.6
Stock-based compensation expense | 67.1 | 63.1 | 70.3
Professional service expenses | 95.2 | 87.1 | 77.9
Insurance costs | 11.7 | 10.5 | 9.3
Other operating expenses | $ 76.4 | $ 58.3 | $ 28.1

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