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Commitment and Contingencies (Tables)
6 Months Ended
Mar. 31, 2025
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
Changes to the carrying amount of our asset retirement obligations were as follows:
30 September 2024$334.7 
Additional accruals(A)
62.0 
Liabilities settled(4.9)
Accretion expense6.4 
Currency translation adjustment
(8.3)
31 March 2025$389.9 
(A)Primarily relates to project exits discussed in Note 4, Business and Asset Actions.