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FINANCE RECEIVABLES - Finance Receivable Credit Quality Indicators (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Total $ 174.5 $ 206.7
Superior    
Financing Receivable, Recorded Investment [Line Items]    
Total 4.1 3.3
Above Average    
Financing Receivable, Recorded Investment [Line Items]    
Total 26.1 31.8
Average    
Financing Receivable, Recorded Investment [Line Items]    
Total 36.5 73.1
Below Average    
Financing Receivable, Recorded Investment [Line Items]    
Total 90.7 79.6
Sub Standard    
Financing Receivable, Recorded Investment [Line Items]    
Total $ 17.1 $ 18.9