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

Lease cost.

No definition available.

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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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