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OTHER ASSETS, NET | 12 Months Ended
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Dec. 31, 2023
OTHER ASSETS, NET |
OTHER ASSETS, NET | 9. OTHER ASSETS, NET Other assets, net consisted of the following as of December 31, 2023 and 2022 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2023 | ​ | 2022
Software development work in progress | ​ | $ | 3.5 | ​ | $ | 8.9
Data processing software | ​ | ​ | 128.1 | ​ | ​ | 124.2
Less accumulated depreciation and amortization | ​ |  | (88.3) | ​ |  | (78.8)
Data processing software, net | ​ |  | 43.3 | ​ |  | 54.3
Other assets (1) | ​ | ​ | 163.0 | ​ | ​ | 127.6
Other assets, net | ​ | $ | 206.3 | ​ | $ | 181.9
(1) At December 31, 2023 and 2022, the majority of the balance included notes receivable, net of allowance, a contra-revenue asset, and long-term prepaid assets. As of December 31, 2023 and 2022, the notes receivable, net balance was $136.9 million and $102.9 million, respectively. See Note 8 (“Credit Losses”) for more information on the notes receivable included within other assets, net on the consolidated balance sheets. See Note 19 (“Stock-Based Compensation”) for more information on the contra-revenue asset related to the issuance of Cboe Digital Restricted Common Units and Warrant Units included within other assets, net on the consolidated balance sheets. As of December 31, 2023 and 2022, the contra-revenue asset balance was $18.1 million and $19.9 million, respectively. ​ Amortization expense related to data processing software was $8.4 million, $7.2 million, and $7.3 million for the years ended December 31, 2023, 2022, and 2021, respectively.

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