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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 |

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