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- Definition

Amount of investment attributable to disposal group held for sale or disposed of.

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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- Definition

Amount of investment in equity security without readily determinable fair value.

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- Definition

Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value.

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- Definition

Amount of gain (loss) included in earnings for investments classified as other.

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- Definition

Amount of investment in equity method investee and investment in and advance to affiliate.

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INVESTMENTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
INVESTMENTS (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Equity Method Investments and Equity Securities Without Readily Determinable Fair Value [Line Items]
Total equity method investments	$ 1.5		$ 1.5		$ 1.5
Total other equity investments	39.1		39.1		30.9
Total investments	40.6		40.6		32.4
Earnings on investments, net	12.8	$ (1.1)	12.1	$ (4.4)
Disposal Group, Held-for-Sale, Not Discontinued Operations \| Cboe Australia and Cboe Canada
Equity Method Investments and Equity Securities Without Readily Determinable Fair Value [Line Items]
Investments, held for sale	0.2		0.2
Investment in 7Ridge Investments 3 LP
Equity Method Investments and Equity Securities Without Readily Determinable Fair Value [Line Items]
Total equity method investments	1.5		1.5		1.5
Investment in CSD BR
Equity Method Investments and Equity Securities Without Readily Determinable Fair Value [Line Items]
Total other equity investments	10.3		10.3		10.3
Investment in Eris Innovations Holdings, LLC
Equity Method Investments and Equity Securities Without Readily Determinable Fair Value [Line Items]
Total other equity investments	19.0		19.0		9.5
Equity, Fair Value, upward price adjustment, annual amount	9.5
Earnings on investments, net	9.5		9.5
Investment in Talos Global, Inc.
Equity Method Investments and Equity Securities Without Readily Determinable Fair Value [Line Items]
Total other equity investments	5.0		5.0		5.0
Investment in Vest Group Inc.
Equity Method Investments and Equity Securities Without Readily Determinable Fair Value [Line Items]
Total other equity investments	2.9		2.9		2.9
Investment in OCC
Equity Method Investments and Equity Securities Without Readily Determinable Fair Value [Line Items]
Total other equity investments	0.3		0.3		0.3
Other equity investments
Equity Method Investments and Equity Securities Without Readily Determinable Fair Value [Line Items]
Total other equity investments	$ 1.6		$ 1.6		$ 2.9