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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Consolidated VIEs, aggregated          
Variable Interest Entity [Line Items]          
Variable interest entities outsourcing agreement initial term     5 years    
VIEs which are not primary beneficiary          
Variable Interest Entity [Line Items]          
Carrying amount $ 72.7   $ 72.7   $ 71.3
(Loss) income from equity method investments (11.5) $ (14.5) (24.6) $ (23.5)  
Eliminations | Consolidated VIEs          
Variable Interest Entity [Line Items]          
Liabilities associated with the certain outsourcing agreements and purchase options $ 125.9   $ 125.9   $ 124.5