pre_text: Lines of Credit The following table summarizes our available lines of credit and committed and uncommitted lines of credit, including the revolving credit facility discussed above, and the amounts available under our accounts receivable securitization programs. (1) Includes total borrowings under the accounts receivable securitization programs, the revolving credit facility and borrowings under lines of credit available to several subsidiaries. (2) Of the total available lines of credit, $1,137.4 million were committed as of December 31, 2019.
table: December 31,
table: (In millions) 2019 2018
table: Used lines of credit (1) $ 98.9 $ 232.8
table: Unused lines of credit 1,245.2 1,135.3
table: Total available lines of credit(2) $ 1,344.1 $ 1,368.1
question: Analyse this data from a financial earnings document. What is the difference between the Unused lines of credit for 2019 and 2018?