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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Segment information |  |
Stock-based compensation expense | $ 17.1 | $ 15.3
Corporate and unallocated |  |
Segment information |  |
Payroll costs | 55.3 | 50.4
Stock-based compensation expense | 17.1 | 15.3
Professional service expenses | 16.3 | 17.5
Other operating expenses | $ 12.1 | $ 10.1

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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 http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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