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FINANCE RECEIVABLES - Finance Receivable Credit Quality Indicators (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]    
Total $ 219.7 $ 199.5
Superior    
Financing Receivable, Recorded Investment [Line Items]    
Total 4.9 7.5
Above Average    
Financing Receivable, Recorded Investment [Line Items]    
Total 29.6 30.7
Average    
Financing Receivable, Recorded Investment [Line Items]    
Total 66.6 56.9
Below Average    
Financing Receivable, Recorded Investment [Line Items]    
Total 110.2 94.5
Sub Standard    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 8.4 $ 9.9