pre_text: (11) Other Non-Current Assets Other non-current assets consist of the following (in millions):
table: December 31,
table: 2019 2018
table: Property records database $60.1 $59.9
table: Contract assets 37.8 17.0
table: Right-of-use assets 26.4 —
table: Deferred compensation plan related assets 15.2 11.1
table: Unbilled receivables 3.5 5.0
table: Prepaid expenses 8.1 18.3
table: Unrealized gains on interest rate swaps — 6.2
table: Other 7.7 4.3
table: Other non-current assets $158.8 $121.8
question: Analyse this data from a financial earnings document. What was the change in prepaid expenses between 2018 and 2019?