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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment information |  |  |
Stock-based compensation expense | $ 70.3 | $ 63.4 | $ 57.1
Corporate and unallocated |  |  |
Segment information |  |  |
Payroll costs | 234.1 | 203.3 | 174.9
Stock-based compensation expense | 69.9 | 63.4 | 57.1
Professional service expenses | 67.6 | 78.5 | 53.6
Insurance costs | 7.5 | 6.1 | 6.0
Other operating expenses | $ 39.0 | $ 42.8 | $ 34.8

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