FINANCE RECEIVABLES - Individually and Collectively Evaluated Impaired Finance Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Allowance for credit losses, ending balance:
Individually evaluated for impairment	$ 7.6		$ 0.6
Collectively evaluated for impairment	3.5		4.9
Total allowance for credit losses	11.1	$ 12.1	5.5	$ 4.5	$ 4.5	$ 6.6
Finance receivables, ending balance:
Individually evaluated for impairment	7.6		1.5
Collectively evaluated for impairment	164.7		198.0
Total finance receivables	172.3		199.5
Commercial Loans
Allowance for credit losses, ending balance:
Individually evaluated for impairment	7.6		0.6
Collectively evaluated for impairment	2.8		3.4
Total allowance for credit losses	10.4	10.9	4.0	3.0	3.0	5.7
Finance receivables, ending balance:
Individually evaluated for impairment	7.6		1.5
Collectively evaluated for impairment	135.6		152.5
Total finance receivables	143.2		154.0
Sales-Type Leases
Allowance for credit losses, ending balance:
Individually evaluated for impairment	0.0		0.0
Collectively evaluated for impairment	0.7		1.5
Total allowance for credit losses	0.7	$ 1.2	1.5	$ 1.5	$ 1.5	$ 0.9
Finance receivables, ending balance:
Individually evaluated for impairment	0.0		0.0
Collectively evaluated for impairment	29.1		45.5
Total finance receivables	$ 29.1		$ 45.5