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GOODWILL AND INTANGIBLE ASSETS, NET - Estimated Future Amortization (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
GOODWILL AND INTANGIBLE ASSETS, NET    
Amortization $ 32.9 $ 32.5
Amortization expense    
Future amortization expense, remainder of 2021 91.1  
2022 110.9  
2023 99.6  
2024 77.9  
2025 $ 67.2