LOANS RECEIVABLE AND REVENUE - Delinquent Loans - Aging Analysis (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	$ 69.4	$ 70.2
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	69.4	70.2
Consumer Portfolio Segment | 0-30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	28.4	31.6
Consumer Portfolio Segment | 31-60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	17.6	18.6
Consumer Portfolio Segment | 61 + days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	23.4	20.0
Consumer Portfolio Segment | Revolving LOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	43.3	37.7
Consumer Portfolio Segment | Revolving LOC | 0-30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	19.1	17.4
Consumer Portfolio Segment | Revolving LOC | 31-60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	10.0	9.3
Consumer Portfolio Segment | Revolving LOC | 61 + days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	14.2	11.0
Consumer Portfolio Segment | Total Installment - Company Owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	26.1	32.5
Consumer Portfolio Segment | Total Installment - Company Owned | 0-30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	9.3	14.2
Consumer Portfolio Segment | Total Installment - Company Owned | 31-60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	7.6	9.3
Consumer Portfolio Segment | Total Installment - Company Owned | 61 + days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	9.2	9.0
Consumer Portfolio Segment | Unsecured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	20.4	24.2
Consumer Portfolio Segment | Unsecured Installment | 0-30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	7.0	10.4
Consumer Portfolio Segment | Unsecured Installment | 31-60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	6.1	7.1
Consumer Portfolio Segment | Unsecured Installment | 61 + days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	7.3	6.7
Consumer Portfolio Segment | Secured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	5.7	8.3
Consumer Portfolio Segment | Secured Installment | 0-30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	2.3	3.8
Consumer Portfolio Segment | Secured Installment | 31-60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	1.5	2.2
Consumer Portfolio Segment | Secured Installment | 61 + days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable	$ 1.9	$ 2.3