ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of year	$ 10.1	$ 6.4
Provisions charged	2.3	4.5
Write-offs, net of recoveries	(0.1)	(0.8)
Balance at end of year	$ 12.3	$ 10.1