Table:
|  | December 31, |  |
| --- | --- | --- |
|  | 2019 | 2018 |
| Property records database | $60.1 | $59.9 |
| Contract assets | 37.8 | 17.0 |
| Right-of-use assets | 26.4 | — |
| Deferred compensation plan related assets | 15.2 | 11.1 |
| Unbilled receivables | 3.5 | 5.0 |
| Prepaid expenses | 8.1 | 18.3 |
| Unrealized gains on interest rate swaps | — | 6.2 |
| Other | 7.7 | 4.3 |
| Other non-current assets | $158.8 | $121.8 |
Paragraphs:
(11) Other Non-Current Assets
Other non-current assets consist of the following (in millions):
Question:
What was the change in unbilled receivables between 2018 and 2019?
Answer: 3.5-5.0 = -1.5