GOODWILL AND INTANGIBLES - Definite Lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6.5	$ 6.5
Accumulated Amortization	2.1	1.1
Net Book Value	$ 4.4	$ 5.4
Weighted avg useful life	4 years 9 months 18 days	5 years 8 months 12 days
Indefinite-lived intangible assets transferred out of definite lived	$ 1.8	$ 0.0
SARL Business Segment
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets transferred to discontinued operations	0.4
Client lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2.3	2.3
Accumulated Amortization	0.9	0.6
Net Book Value	$ 1.4	$ 1.7
Weighted avg useful life	7 years	8 years
Client lists | Minimum Years
Finite-Lived Intangible Assets [Line Items]
Amortization Period (Years)	5 years	5 years
Client lists | Maximum Years
Finite-Lived Intangible Assets [Line Items]
Amortization Period (Years)	10 years	10 years
Leases
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 0.8	$ 0.8
Accumulated Amortization	0.4	0.3
Net Book Value	$ 0.4	$ 0.5
Weighted avg useful life	3 years 1 month 6 days	4 years 1 month 6 days
Leases | Minimum Years
Finite-Lived Intangible Assets [Line Items]
Amortization Period (Years)	3 years	3 years
Leases | Maximum Years
Finite-Lived Intangible Assets [Line Items]
Amortization Period (Years)	6 years	6 years
Domain name
Finite-Lived Intangible Assets [Line Items]
Amortization Period (Years)	5 years	5 years
Gross Carrying Amount	$ 3.4	$ 3.4
Accumulated Amortization	0.8	0.2
Net Book Value	$ 2.6	$ 3.2
Weighted avg useful life	3 years 9 months 18 days	4 years 9 months 18 days