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ASSET RETIREMENT OBLIGATIONS (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Asset Retirement Obligation Disclosure [Abstract]    
Balance at January 1 $ 374.2 $ 479.3
Accretion 7.4 8.5
Additions 165.7 16.6
Liabilities settled (3.7) (1.5)
Balance at June 30 $ 543.6 $ 502.9