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ASSET RETIREMENT OBLIGATIONS (Asset Retirement Obligations Operating Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
ASSET RETIREMENT OBLIGATIONS [Abstract]        
Accretion $ 3.6 $ 3.3 $ 10.7 $ 9.8
Depreciation 2.4 3.0 7.2 8.2
Total $ 6.0 $ 6.3 $ 17.9 $ 18.0