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Schedule of Change in Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2023
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
A reconciliation of our AROs is as follows:
(in millions)June 30, 2023December 31, 2022
AROs, beginning of period$1,905.6 $1,749.3 
Liabilities incurred9.7 14.9 
Liabilities settled(95.9)(205.6)
Accretion expense46.0 81.6 
Revisions in estimated cash flows80.5 264.5 
Foreign currency translation23.4 0.9 
AROs, end of period1,969.3 1,905.6 
Less current portion266.0 212.3 
Non-current portion of AROs$1,703.3 $1,693.3