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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2025
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliations of the Company's ARO liability
Reconciliations of the Company’s asset retirement obligations are as follows:
 December 31,
 20252024
 (Dollars in millions)
Balance at beginning of period$723.7 $702.8 
Liabilities settled(51.2)(51.7)
Accretion expense54.6 51.4 
Revisions to estimates27.8 21.2 
Balance at end of period$754.9 $723.7 
Less: Current portion (included in “Accounts payable and accrued expenses”)62.1 55.9 
Noncurrent obligation (included in “Asset retirement obligations, less current portion”)$692.8 $667.8 
Balance at end of period — active locations$567.6 $507.9 
Balance at end of period — closed or inactive locations$187.3 $215.8