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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment information |  |
Stock-based compensation expense | $ 18.4 | $ 17.1
Corporate and unallocated |  |
Segment information |  |
Payroll costs | 65.1 | 55.3
Stock-based compensation expense | 18.3 | 17.1
Professional service expenses | 20.4 | 16.3
Other operating expenses | $ 12.1 | $ 12.1

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