RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Revenue from related parties	$ 1.2	$ 1.3	$ 3.8	$ 4.0
Accounts receivable	0.8		0.8		$ 1.0
InteliStaf [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 4.6	3.1	$ 13.3	9.1
Joint venture, percent ownership	68.00%		68.00%
Receivable balance with joint venture	$ 1.7		$ 1.7		1.5
Payable balance with joint venture	0.3		0.3		$ 0.2
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Rent expense	$ 0.1	$ 0.1	$ 0.3	$ 0.3