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Provisions - Activity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of other provisions [line items]    
Provisions, beginning $ 474.0  
Provisions, ending 462.4 $ 474.0
Closure and decommissioning    
Disclosure of other provisions [line items]    
Provisions, beginning 447.1 296.2
Increase from Acquisition 0.0 244.0
Dispositions (Note 9) (89.2) (129.9)
Revisions in estimates and obligations 74.2 29.9
Expenditures (25.1) (27.3)
Accretion expense (Note 25) 31.3 34.2
Provisions, ending 438.3 447.1
Litigation    
Disclosure of other provisions [line items]    
Provisions, beginning 10.5  
Increase from Acquisition 0.0 34.6
Dispositions (Note 9) (1.3) (18.2)
Provisions, ending $ 25.4 $ 10.5