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LEASE ACCOUNTING - Schedule of Aggregate Lease Costs by Lease Classification (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Lease Cost [Line Items] |  |  |
Office leases | $ 280.8 | $ 279.8 | $ 269.7
Equipment | Utilities and Other |  |  |
Lease Cost [Line Items] |  |  |
Short term lease payments | 3.6 | 3.9 | 1.8
Real Estate | Facility Lease Expense |  |  |
Lease Cost [Line Items] |  |  |
Variable lease payments | 68.3 | 36.4 | 11.8
Office leases | $ 1.4 | $ 1.3 | $ 1.3

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- Definition Amount cash outflow for variable lease payments, net of lease credits and abatements, excluded from lease liability. + References No definition available. + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of cash outflow for short-term lease payment excluded from lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-5 + Details
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