INCOME TAXES - Deferred Income Taxes (Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Property, equipment and software	$ (60.3)	$ (43.2)	$ (64.1)
Accrued, deferred, and long-term incentive compensation	(14.2)	(28.6)	11.8
Operating lease assets	(1.7)	(6.3)	24.8
Operating lease liabilities	5.0	3.8	(24.3)
Acquisition-related retention liability	(12.9)	(14.8)	(13.6)
Contingent consideration liability	3.1	15.4	32.4
Acquired investments	(27.9)	(19.5)	(73.0)
Unrealized gains (losses) recognized in non-operating income	16.8	43.8	(114.6)
Net operating losses	(11.2)	(31.5)	(11.0)
Change in valuation allowance	16.1	86.4	16.4
Other	(0.8)	3.1	8.2
Total net deferred income taxes (benefits)	$ (88.0)	$ 8.6	$ (207.0)

Deferred Income Tax Expense (Benefit), Related to Accrued, Deferred, and Long-term Incentive Compensation

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- Definition

Deferred Income Tax Expense (Benefit), Related To Acquired Investments

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- Definition

Deferred Income Tax Expense (Benefit), Related To Acquisition-Related Retention Liability

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- Definition

Deferred Income Tax Expense (Benefit), Related To Change In Valuation Allowance

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- Definition

Deferred Income Tax Expense (Benefit), Related To Contingent Consideration Liability

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- Definition

Deferred Income Tax Expense (Benefit), Related To Net Operating Losses

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- Definition

Deferred Income Tax Expense (Benefit), Related to Property, Equipment And Software

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- Definition

Deferred Income Tax Expense (Benefit), Related to Operating Lease Assets

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Deferred Income Tax Expense (Benefit), Related to Operating Lease Liabilities

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- Definition

Deferred Income Tax Expense (Benefit), Related to Other

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- Definition

Deferred Income Tax Expense (Benefit), Related to Unrealized Holding Gains Recognized in Income

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- Definition

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(1)(Note 1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-SubTopic 10
-Topic 740
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-9

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