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OTHER ASSETS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Assets [Abstract]      
Supply contracts $ 1,061.8 $ 1,048.0  
Other 56.7 54.5  
Other assets 1,118.5 1,102.5  
Long-term Other Supply Contract Payments $ 64.5 37.7 $ 0.0
Supply Contract Weighted-average Useful Life 20 years    
Supply Contract Amortization $ 71.2 $ 70.4 $ 69.4
Supply Contract Amortization Expense Next Twelve Months 71.4    
Supply Contract Amortization Expense, Year 2 71.4    
Supply Contract Amortization Expense, Year 3 71.4    
Supply Contract Amortization Expense, Year 4 69.8    
Supply Contract Amortization Expense, Year 5 $ 66.5