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GOODWILL AND INTANGIBLE ASSETS, NET - Estimated Future Amortization Expense (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 26.3  
2020 34.1  
2021 33.2  
2022 32.3  
2023 30.7  
Thereafter 215.4  
Finite-lived intangible assets, net carrying amount $ 372.0 $ 386.8