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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 1,768.6 $ 1,738.0 $ 644.5
Intangible assets, net 490.7 552.4  
Amortization of intangible assets $ 85.2 $ 86.4 $ 69.0