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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment information |  |  |  |
Stock-based compensation expense | $ 15.9 | $ 15.6 | $ 33.0 | $ 30.9
Corporate and unallocated |  |  |  |
Segment information |  |  |  |
Payroll costs | 56.5 | 50.5 | 111.8 | 100.9
Stock-based compensation expense | 15.9 | 15.6 | 33.0 |
Professional service expenses | 17.1 | 18.4 | 33.5 | 35.9
Other operating expenses | $ 11.8 | $ 14.1 | $ 23.8 | $ 24.2

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