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OTHER ASSETS, NET (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Intangible Assets |  |  |
Less accumulated depreciation and amortization | $ (88.3) | $ (78.8) |
Data processing software, net | 43.3 | 54.3 |
Other assets | 163.0 | 127.6 |
Total other assets, net | 206.3 | 181.9 |
Notes receivable, net | 136.9 | 102.9 |
Contra-revenue assets | 18.1 | 19.9 |
Amortization expense | 116.6 | 124.3 | $ 126.6
Software development work in progress |  |  |
Intangible Assets |  |  |
Software | 3.5 | 8.9 |
Data processing software |  |  |
Intangible Assets |  |  |
Software | 128.1 | 124.2 |
Amortization expense | $ 8.4 | $ 7.2 | $ 7.3

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