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BUSINESS COMBINATIONS - Schedule of Estimated Future Aggregate Amortization Expense of Definite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
2019 (remainder of the year) $ 5.5  
2020 20.9  
2021 18.6  
2022 12.7  
2023 6.3  
Thereafter 32.8  
Total 96.8 $ 115.4
2018 Acquisitions    
Business Acquisition [Line Items]    
2019 (remainder of the year) 0.9  
2020 3.6  
2021 2.8  
2022 2.6  
2023 1.6  
Thereafter 1.8  
Total $ 13.3