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ASSET RETIREMENT OBLIGATIONS (Asset Retirement Obligations Operating Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
ASSET RETIREMENT OBLIGATIONS [Abstract]        
Accretion $ 3.5 $ 3.6 $ 10.3 $ 10.7
Depreciation 2.2 2.4 6.6 7.2
Total $ 5.7 $ 6.0 $ 16.9 $ 17.9