FINANCE RECEIVABLES - Finance Receivables, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables transferred as sales	$ 72.0	$ 60.5	$ 228.1	$ 149.5
Loans receivables held-for-sale	16.6		16.6			$ 26.0
Total finance receivables, gross	162.7		162.7			206.7
Allowance for credit losses	(4.5)	(7.1)	(4.5)	(7.1)	$ (4.5)	(6.6)	$ (6.3)	$ (6.3)
Total finance receivables, net	158.2		158.2			200.1
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables, gross	119.9		119.9			180.2
Allowance for credit losses	(3.0)	(6.6)	(3.0)	(6.6)	(3.0)	(5.7)	(5.9)	(5.9)
Sales-type leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables, gross	42.8		42.8			26.5
Allowance for credit losses	(1.5)	$ (0.5)	(1.5)	$ (0.5)	$ (1.5)	(0.9)	$ (0.4)	$ (0.4)
Prepaid Expenses and Other Current Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables, net	59.0		59.0			84.0
Other assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables, net	$ 99.0		$ 99.0			$ 116.0