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FINANCE RECEIVABLES - Finance Receivable Credit Quality Indicators (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Total finance receivables, gross $ 206.7 $ 250.2
Superior    
Financing Receivable, Recorded Investment [Line Items]    
Total finance receivables, gross 3.3 9.6
Above Average    
Financing Receivable, Recorded Investment [Line Items]    
Total finance receivables, gross 31.8 64.7
Average    
Financing Receivable, Recorded Investment [Line Items]    
Total finance receivables, gross 73.1 111.8
Below Average    
Financing Receivable, Recorded Investment [Line Items]    
Total finance receivables, gross 79.6 53.0
Sub Standard    
Financing Receivable, Recorded Investment [Line Items]    
Total finance receivables, gross $ 18.9 $ 11.1