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OTHER ASSETS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Other Assets [Abstract]          
Supply contracts $ 1,082.7 $ 1,052.9 $ 1,082.7 $ 1,052.9 $ 1,061.8
Other 62.1 55.7 62.1 55.7 56.7
Other assets 1,144.8 1,108.6 1,144.8 1,108.6 $ 1,118.5
Payments under other long-term supply contracts     46.7 29.6  
Amortization of Supply Contracts $ 18.3 $ 17.8 $ 36.6 $ 35.6