OTHER ASSETS, NET (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Intangible Assets
Less accumulated depreciation and amortization	$ (96.3)		$ (96.3)		$ (88.3)
Data processing software, net	47.5		47.5		43.3
Other assets	173.3		173.3		163.0
Total other assets, net	220.8		220.8		206.3
Notes receivable, net	157.2		157.2		136.9
Contra-revenue assets	0.0		0.0		18.1
Amortization expense	20.7	$ 28.2	68.2	$ 88.4
Software development work in progress
Intangible Assets
Software	16.1		16.1		3.5
Data processing software
Intangible Assets
Software	127.7		127.7		$ 128.1
Amortization expense	$ 2.5	$ 2.1	$ 7.5	$ 6.2

Amount of contra revenue assets arising from the issuance of Cboe digital restricted common units and warrants.

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For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

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Amount, after allowance for credit loss, of accounts and financing receivables, classified as noncurrent. Includes, but is not limited to, notes and loan receivable.

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