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FAIR VALUE OF ASSETS AND LIABILITIES - Fair Value of Financial Instruments Held by Consolidated Investments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 973.1	$ 986.5	$ 1,044.9
Total return swap related to deferred compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total return swap related to deferred compensation plans		9.4
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	973.1	986.5
Equity investments	328.9	371.2
Fair Value | Total return swap related to deferred compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total return swap related to deferred compensation plans	$ 26.6	$ (9.4)

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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