GOODWILL AND INTANGIBLES - Definite Lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6.2	$ 6.2
Accumulated Amortization	4.7	1.8
Net Book Value	$ 1.5	$ 4.4
Weighted avg useful life	5 years 2 months 12 days	4 years 9 months 18 days
French Business Unit
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, transfer to discontinued operations			$ 0.3
Finite-lived intangible assets, amortization, transfer to discontinued operations		$ 0.3
Client lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2.0	2.0
Accumulated Amortization	0.8	0.6
Net Book Value	$ 1.2	$ 1.4
Weighted avg useful life	6 years 1 month 6 days	7 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	0.5	0.4
Net Book Value	$ 0.3	$ 0.4
Weighted avg useful life	1 year 10 months 24 days	3 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	3.4	0.8
Net Book Value	$ 0.0	$ 2.6
Weighted avg useful life	0 years	3 years 9 months 18 days