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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment information |  |  |  |
Stock-based compensation expense | $ 17.3 | $ 15.9 | $ 35.7 | $ 33.0
Other operating expenses |  |  | 24.4 |
Corporate and unallocated |  |  |  |
Segment information |  |  |  |
Payroll costs | 61.2 | 56.5 | 126.3 | 111.8
Stock-based compensation expense | 17.3 | 15.9 | 35.6 | 33.0
Professional service expenses | 21.0 | 17.1 | 41.4 | 33.5
Intellectual property claim | 16.9 |  | $ 16.9 |
Other operating expenses | $ 12.3 | $ 11.8 |  | $ 23.8

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