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Commitments and Contingencies (Tables)
 12 Months Ended
Sep. 30, 2020
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 2018$190.4 
Additional accruals14.7 
Liabilities settled(2.1)
Accretion expense8.7 
Currency translation adjustment(3.5)
Balance at 30 September 2019$208.2 
Additional accruals22.0 
Liabilities settled(2.8)
Accretion expense9.5 
Currency translation adjustment4.5 
Balance at 30 September 2020$241.4 
Schedule of Unconditional Purchase Obligations Disclosure
We are obligated to make future payments under unconditional purchase obligations as summarized below:
2021$1,460 
2022460 
2023450 
2024455 
2025454 
Thereafter6,277 
Total$9,556