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ASSET RETIREMENT OBLIGATIONS (Asset Retirement Obligations Operating Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
ASSET RETIREMENT OBLIGATIONS [Abstract]        
Accretion $ 3.4 $ 3.6 $ 6.9 $ 7.1
Depreciation 2.2 2.4 4.3 4.8
Total $ 5.6 $ 6.0 $ 11.2 $ 11.9