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BUSINESS COMBINATIONS - Schedule of Estimated Future Aggregate Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
2020 $ 20.9  
2021 18.6  
2022 12.7  
2023 6.3  
2024 6.0  
Thereafter 26.7  
Net 91.2 $ 115.4
2018 Acquisitions    
Business Acquisition [Line Items]    
2020 3.6  
2021 2.8  
2022 2.6  
2023 1.6  
2024 1.4  
Thereafter 0.4  
Net $ 12.4