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Schedule of Change in Asset Retirement Obligations (Tables)
3 Months Ended
Mar. 31, 2024
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)March 31, 2024December 31, 2023
AROs, beginning of period$2,213.4 $1,905.6 
Liabilities incurred8.8 22.9 
Liabilities settled(49.5)(198.5)
Accretion expense27.2 96.1 
Revisions in estimated cash flows14.2 365.1 
Foreign currency translation(12.0)22.2 
AROs, end of period2,202.1 2,213.4 
Less current portion389.2 377.4 
Non-current portion of AROs$1,812.9 $1,836.0