v3.26.1
ASSET RETIREMENT OBLIGATIONS (Tables)
 3 Months Ended
Mar. 31, 2026
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Asset Retirement Obligations Operating Costs
ARO operating costs related to accretion of the liabilities and depreciation of the assets are as follows:
Three Months Ended
March 31
in millions20262025
ARO Operating Costs
Accretion$5.0 $4.3 
Depreciation3.7 3.9 
Total ARO operating costs$8.7 $8.2 
Schedule of Reconciliations of Asset Retirement Obligations
Reconciliations of the carrying amounts of our ARO liabilities are as follows:
Three Months Ended
March 31
in millions20262025
Asset Retirement Obligations
ARO liability balance at beginning of period
$456.5 $427.4 
Liabilities incurred0.0 0.0 
Liabilities settled
(3.0)(5.9)
Accretion expense5.0 4.3 
Revisions, net
1.5 3.7 
ARO liability balance at end of period
$460.0 $429.5