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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Future minimum purchase commitments [Abstract]      
2021 $ 722.8    
2022 657.4    
2023 657.4    
2024 651.3    
2025 541.2    
Thereafter 2,390.6    
Total commitments 5,620.7    
Legal action liabilities 13.5 $ 12.4  
Gain in Other Operating Income due to Insurance Recoveries $ 0.0 $ 0.0 $ 8.0