OTHER ASSETS, NET (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Intangible Assets
Less accumulated depreciation and amortization	$ (93.3)		$ (93.3)		$ (88.3)
Data processing software, net	38.2		38.2		43.3
Other assets	170.4		170.4		163.0
Total other assets, net	208.6		208.6		206.3
Notes receivable, net	154.7		154.7		136.9
Contra-revenue assets	0.0		0.0		18.1
Amortization expense	21.3	$ 29.3	47.5	$ 60.2
Software development work in progress
Intangible Assets
Software	4.6		4.6		3.5
Data processing software
Intangible Assets
Software	126.9		126.9		$ 128.1
Amortization expense	$ 2.5	$ 2.1	$ 5.0	$ 4.1

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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