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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
SEGMENT INFORMATION |  |
Stock-based compensation expense | $ 16.1 | $ 16.3
Corporate and Unallocated |  |
SEGMENT INFORMATION |  |
Payroll costs | 80.3 | 68.1
Stock-based compensation expense | 15.7 | 16.2
Professional service expenses | 22.1 | 26.4
Other operating expenses | $ 18.0 | $ 13.9

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- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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