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ASSET RETIREMENT OBLIGATIONS (Tables)
 12 Months Ended
Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Asset Retirement Obligations, Operating Costs
For the years ended December 31, ARO operating costs related to accretion of the liabilities and depreciation of the assets are as follows:
in millions202420232022
Accretion$14.7 $13.9 $14.1 
Depreciation12.5 9.0 9.4 
Total ARO operating costs$27.2 $22.9 $23.5 
Schedule of Reconciliations of Asset Retirement Obligations
Reconciliations of the carrying amounts of our AROs for the years ended December 31 are as follows:
in millions20242023
ARO balance at beginning of year$324.1 $311.3 
Liabilities incurred42.3 0.0 
Liabilities settled(19.1)(9.9)
Accretion expense14.7 13.9 
Revisions, net65.4 8.8 
ARO balance at end of year$427.4 $324.1