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Commitments and Contingencies (Tables)
9 Months Ended
Jun. 30, 2026
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 2025$406.2 
Additional accruals(A)
83.7 
Liabilities settled(21.2)
Accretion expense10.6 
Currency translation adjustment and other1.4 
30 June 2026$480.7 
(A) Primarily relates to project exit decisions discussed in Note 4, Business and Asset Actions.