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ASSET RETIREMENT OBLIGATIONS (Asset Retirement Obligations Operating Costs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
ASSET RETIREMENT OBLIGATIONS [Abstract]      
Accretion $ 14.1 $ 13.1 $ 12.4
Depreciation 9.4 10.6 8.6
Total $ 23.5 $ 23.7 $ 21.0