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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment information |  |  |  |
Stock-based compensation expense | $ 16.7 | $ 19.5 | $ 52.4 | $ 53.0
Other operating expenses |  |  | 22.4 |
Corporate and unallocated |  |  |  |
Segment information |  |  |  |
Payroll costs | 63.4 | 61.7 | 189.7 | 173.5
Stock-based compensation expense | 16.7 | 19.2 | 52.2 | 52.7
Professional service expenses | 19.3 | 16.7 | 60.6 | 50.1
Intellectual property claim |  |  | $ 16.9 |
Other operating expenses | $ 14.8 | $ 11.6 |  | $ 35.5

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