FAIR VALUE MEASUREMENT (Tables)

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Schedule of fair value hierarchy for assets and liabilities measured at fair value on a recurring basis

The following tables present the Company’s fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis as of December 31, 2025 and 2024 (in millions):

	December 31, 2025
	Total		Level 1		Level 2		Level 3
Assets:
U.S. and UK Treasury securities (1)	$	1,294.1	$	1,294.1	$	—	$	—
Money market funds (1)	248.1		248.1		—		—
U.S. Treasury securities (2)	0.3		0.3		—		—
Marketable securities (2):
Mutual funds	28.5		28.5		—		—
Money market funds	7.3		7.3		—		—
Total assets	$	1,578.3	$	1,578.3	$	—	$	—

	December 31, 2024
	Total		Level 1		Level 2		Level 3
Assets:
U.S. Treasury securities (2)	$	70.0	$	70.0	$	—	$	—
Marketable securities (2):
Mutual funds	23.8		23.8		—		—
Money market funds	16.5		16.5		—		—
Note receivable - building sale (3)	6.2		—		—		6.2
Total assets	$	116.5	$	110.3	$	—	$	6.2

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(1)These amounts are reflected within cash and cash equivalents in the consolidated balance sheets.

(2)These amounts are reflected within financial investments in the consolidated balance sheets.

(3)This amount is reflected within other assets, net in the consolidated balance sheets.

Schedule of fair value hierarchy for assets and liabilities held

The following tables present the Company’s fair value hierarchy for certain assets and liabilities held by the Company as of December 31, 2025 and 2024 (in millions):

	December 31, 2025
	Total		Level 1		Level 2		Level 3
Assets:
U.S. and UK Treasury securities (1)	$	1,294.1	$	1,294.1	$	—	$	—
Money market funds (1)	248.1		248.1		—		—
U.S. Treasury securities (2)	0.3		0.3		—		—
Deferred compensation plan assets (2)	35.8		35.8		—		—
Total assets	$	1,578.3	$	1,578.3	$	—	$	—
Liabilities:
Deferred compensation plan liabilities (4)	$	35.8	$	35.8	$	—	$	—
Debt (5)	1,371.8		—		1,371.8		—
Total liabilities	$	1,407.6	$	35.8	$	1,371.8	$	—

	December 31, 2024
	Total		Level 1		Level 2		Level 3
Assets:
U.S. Treasury securities (2)	$	70.0	$	70.0	$	—	$	—
Deferred compensation plan assets (2)	40.3		40.3		—		—
Note receivable - building sale (3)	6.2		—		—		6.2
Total assets	$	116.5	$	110.3	$	—	$	6.2
Liabilities:
Deferred compensation plan liabilities (4)	$	40.3	$	40.3	$	—	$	—
Debt (5)	1,317.0		—		1,317.0		—
Total liabilities	$	1,357.3	$	40.3	$	1,317.0	$	—

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(1)These amounts are reflected within cash and cash equivalents in the consolidated balance sheets.

(2)These amounts are reflected within financial investments in the consolidated balance sheets.

(3)This amount is reflected within other assets, net in the consolidated balance sheets.

(4)These amounts are reflected within other non-current liabilities in the consolidated balance sheets.

(5)These balances are presented at fair value in this table, but are carried at their historical value within the consolidated balance sheets.

Schedule of fair value of debt obligation

At December 31, 2025 and 2024, the fair values of the Company’s debt obligations were as follows (in millions):

	December 31, 2025		December 31, 2024
3.650% Senior Notes	$	648.9	$	638.4
1.625% Senior Notes	444.6		416.2
3.000% Senior Notes	278.3		262.4

Summary of changes in the fair value of Level 3 financial liabilities

The following table sets forth a summary of changes in the fair value of the Company’s Level 3 financial assets and liabilities during the year ended December 31, 2025 and 2024 (in millions):

	Level 3 Financial Assets and Liabilities for the Year Ended December 31, 2025
	Balance at Beginning of Period		(Losses) Gains during Period		Adjustments		Additions		Settlements		Foreign Currency Translation		Balance at End of Period
Assets:
Note receivable - building sale	$	6.2	$	0.8	$	—	$	—	$	(7.0)	$	—	$	—
Total assets	$	6.2	$	0.8	$	—	$	—	$	(7.0)	$	—	$	—

	Level 3 Financial Assets and Liabilities for the Year Ended December 31, 2024
	Balance at Beginning of Period		(Losses) Gains during Period		Adjustments		Additions		Settlements		Foreign Currency Translation		Balance at End of Period
Assets:
Note receivable - building sale	$	—	$	(0.8)	$	—	$	7.0	$	—	$	—	$	6.2
Total assets	$	—	$	(0.8)	$	—	$	7.0	$	—	$	—	$	6.2
	Balance at Beginning of Period		Losses (Gains) during Period		Adjustments		Additions		Settlements		Foreign Currency Translation		Balance at End of Period
Liabilities:
Contingent consideration liabilities	$	11.8	$	2.0	$	—	$	—	$	(13.9)	$	0.1	$	—
Cboe Digital restricted common units liability	18.7		(1.0)		(12.1)		—		(5.6)		—		—
Cboe Digital warrant liability	5.9		(1.4)		(4.1)		—		(0.4)		—		—
Total liabilities	$	36.4	$	(0.4)	$	(16.2)	$	—	$	(19.9)	$	0.1	$	—