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GOODWILL AND INTANGIBLE ASSETS, NET - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
reporting_unit
Dec. 31, 2018
USD ($)
Goodwill [Line Items]      
Goodwill $ 673,900,000 $ 673,700,000 $ 673,900,000
Number of reporting units | reporting_unit   6  
Amortization expense   $ 40,300,000 57,100,000
Impairment of intangible assets   0 0
Goodwill impairment charge   $ 0  
Mass Portfolio      
Goodwill [Line Items]      
Goodwill 54,300,000   $ 54,300,000
Goodwill impairment charge $ 18,000,000.0