LOANS RECEIVABLE AND REVENUE - Delinquent Loans, Credit Services Organization - Aging Analysis (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	$ 4.1	$ 6.3
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	4.1	6.3
Consumer Portfolio Segment | 0-30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	3.4	5.6
Consumer Portfolio Segment | 31-60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	0.5	0.5
Consumer Portfolio Segment | 61 + days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	0.2	0.2
Consumer Portfolio Segment | Unsecured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	4.0	6.1
Consumer Portfolio Segment | Unsecured Installment | 0-30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	3.3	5.4
Consumer Portfolio Segment | Unsecured Installment | 31-60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	0.5	0.5
Consumer Portfolio Segment | Unsecured Installment | 61 + days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	0.2	0.2
Consumer Portfolio Segment | Secured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	0.1	0.2
Consumer Portfolio Segment | Secured Installment | 0-30 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	0.1	0.2
Consumer Portfolio Segment | Secured Installment | 31-60 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	0.0	0.0
Consumer Portfolio Segment | Secured Installment | 61 + days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	$ 0.0	$ 0.0