FINANCE RECEIVABLES - Finance Receivable Credit Quality Indicators (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total finance receivables, gross	$ 200.7	$ 206.7
Superior
Financing Receivable, Recorded Investment [Line Items]
Total finance receivables, gross	8.4	3.3
Above Average
Financing Receivable, Recorded Investment [Line Items]
Total finance receivables, gross	32.3	31.8
Average
Financing Receivable, Recorded Investment [Line Items]
Total finance receivables, gross	45.1	73.1
Below Average
Financing Receivable, Recorded Investment [Line Items]
Total finance receivables, gross	104.7	79.6
Sub Standard
Financing Receivable, Recorded Investment [Line Items]
Total finance receivables, gross	$ 10.2	$ 18.9