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Commitments and Contingencies (Tables)
 12 Months Ended
Sep. 30, 2022
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:
Balance at 30 September 2020$241.4 
Additional accruals16.5 
Liabilities settled(4.1)
Accretion expense10.5 
Currency translation adjustment5.3 
Balance at 30 September 2021$269.6 
Additional accruals17.9 
Liabilities settled(7.8)
Accretion expense11.1 
Currency translation adjustment(16.1)
Balance at 30 September 2022$274.7 
Schedule of Unconditional Purchase Obligations Disclosure
We are obligated to make future payments under unconditional purchase obligations as summarized below:
2023$3,788 
2024500 
2025489 
2026522 
2027549 
Thereafter4,740 
Total$10,588