Commitments and Contingencies (Tables)

12 Months Ended

Sep. 30, 2021

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 2019	$208.2
Additional accruals	22.0
Liabilities settled	(2.8)
Accretion expense	9.5
Currency translation adjustment	4.5
Balance at 30 September 2020	$241.4
Additional accruals	16.5
Liabilities settled	(4.1)
Accretion expense	10.5
Currency translation adjustment	5.3
Balance at 30 September 2021	$269.6

Schedule of Unconditional Purchase Obligations Disclosure

We are obligated to make future payments under unconditional purchase obligations as summarized below:

2022	$1,656
2023	540
2024	543
2025	563
2026	545
Thereafter	6,135
Total	$9,982