OTHER ASSETS, NET (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Intangible Assets
Less accumulated depreciation and amortization	$ (85.6)		$ (85.6)		$ (78.8)
Data processing software, net	38.1		38.1		54.3
Other assets	151.5		151.5		127.6
Total other assets, net	189.6		189.6		181.9
Notes receivable, net	131.1		131.1		102.9
Contra-revenue assets	19.4		19.4		19.9
Amortization expense	28.2	$ 30.6	88.4	$ 91.0
Software development work in progress
Intangible Assets
Software	6.4		6.4		8.9
Data processing software
Intangible Assets
Software	117.3		117.3		$ 124.2
Amortization expense	$ 2.1	$ 1.8	$ 6.2	$ 5.3

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

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

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Amount of noncurrent assets classified as other.

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