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SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEGMENT INFORMATION |  |  |
Stock-based compensation expense | $ 64.1 | $ 70.5 | $ 70.3
Corporate and Unallocated |  |  |
SEGMENT INFORMATION |  |  |
Payroll costs | 278.7 | 258.6 | 234.1
Stock-based compensation expense | 63.1 | 70.3 | 69.9
Professional service expenses | 87.1 | 77.9 | 67.6
Insurance costs | 10.5 | 9.3 | 7.5
Other operating expenses | $ 58.3 | $ 28.1 | $ 39.0

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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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