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OTHER ASSETS, NET | 12 Months Ended
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Dec. 31, 2021
OTHER ASSETS, NET |
OTHER ASSETS, NET | 9. OTHER ASSETS, NET Other assets, net consisted of the following as of December 31, 2021 and 2020 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Software development work in progress | ​ | $ | 5.6 | ​ | $ | 8.4
Data processing software | ​ | ​ | 103.8 | ​ | ​ | 92.6
Less accumulated depreciation and amortization | ​ |  | (70.9) | ​ |  | (63.5)
Data processing software, net | ​ |  | 38.5 | ​ |  | 37.5
Other assets (1) | ​ | ​ | 87.3 | ​ | ​ | 38.8
Other assets, net | ​ | $ | 125.8 | ​ | $ | 76.3
(1) | At December 31, 2021 and December 31, 2020, the majority of the balance included long-term prepaid assets and notes receivable. See Note 8 (“Credit Losses”) for more information on the notes receivable included within other assets, net on the consolidated balance sheets. As of December 31, 2021 and December 31, 2020, the notes receivable, net balance was $79.3 million and $32.6 million, respectively.
​ Amortization expense related to data processing software was $7.3 million, $6.9 million, and $13.5 million for the years ended December 31, 2021, 2020, and 2019, respectively.

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