FINANCE RECEIVABLES - Finance Receivables, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables transferred as sales	$ 91.3	$ 43.5
Loans receivables held-for-sale	29.3
Total finance receivables, gross	173.2		$ 206.7
Allowance for credit losses	(3.8)	(6.0)	(6.6)	$ (6.3)
Total finance receivables, net	169.4		200.1
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables, gross	131.3		180.2
Allowance for credit losses	(2.3)	(5.6)	(5.7)	(5.9)
Sales-type leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables, gross	41.9		26.5
Allowance for credit losses	(1.5)	$ (0.4)	(0.9)	$ (0.4)
Prepaid Expenses and Other Current Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables, net	74.0		85.0
Other assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables, net	$ 95.0		$ 116.0