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Commitments and Contingencies (Tables)
 12 Months Ended
Sep. 30, 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 2023$297.3 
Additional accruals33.3 
Liabilities settled(13.7)
Accretion expense12.0 
Currency translation adjustment5.8 
30 September 2024$334.7 
Additional accruals(A)
87.5 
Liabilities settled(11.7)
Accretion expense13.0 
Currency translation adjustment(1.6)
Reclass to liabilities held for sale
(15.7)
30 September 2025$406.2 
(A)Primarily relates to project exits discussed in Note 5, Business and Asset Actions.
Schedule of Unconditional Purchase Obligations Disclosure
We are obligated to make future payments under unconditional purchase obligations as summarized below:
2026$4,446 
2027779 
2028608 
2029634 
2030621 
Thereafter3,380 
Total$10,468