LOANS RECEIVABLE AND REVENUE - Loans Receivable by Product, Credit Services Organization (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current loans receivable Guaranteed by the Company	$ 28.3	$ 37.9
Delinquent loans receivable Guaranteed by the Company	4.1	6.3
Total loans receivable Guaranteed by the Company	32.4	44.2
Less: Liability for losses on CSO lender-owned consumer loans	(4.7)	(7.2)
Loans receivable Guaranteed by the Company, net	27.7	37.0
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans receivable Guaranteed by the Company	4.1	6.3
Less: Liability for losses on CSO lender-owned consumer loans	(4.7)	(7.2)	$ (7.2)	$ (10.6)
Consumer Portfolio Segment | Unsecured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current loans receivable Guaranteed by the Company	27.7	37.1
Delinquent loans receivable Guaranteed by the Company	4.0	6.1
Total loans receivable Guaranteed by the Company	31.7	43.2
Less: Liability for losses on CSO lender-owned consumer loans	(4.7)	(7.2)	(7.2)	(10.6)
Loans receivable Guaranteed by the Company, net	27.0	36.0
Consumer Portfolio Segment | Secured Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current loans receivable Guaranteed by the Company	0.6	0.8
Delinquent loans receivable Guaranteed by the Company	0.1	0.2
Total loans receivable Guaranteed by the Company	0.7	1.0
Less: Liability for losses on CSO lender-owned consumer loans	0.0	0.0	$ 0.0	$ 0.0
Loans receivable Guaranteed by the Company, net	$ 0.7	$ 1.0