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GOODWILL, INTANGIBLES AND OTHER ASSETS - Definite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 5.4 $ 5.4
Accumulated Amortization 4.8 4.6
Net Book Value $ 0.6 $ 0.8
Weighted avg useful life 3 years 1 month 6 days 4 years 1 month 6 days
Client lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 2.0 $ 2.0
Accumulated Amortization 1.4 1.2
Net Book Value $ 0.6 $ 0.8
Weighted avg useful life 3 years 1 month 6 days 4 years 1 month 6 days
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
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 3.4
Net Book Value $ 0.0 $ 0.0
Weighted avg useful life 0 years 0 years