Commitments and Contingencies (Litigation and Environmental - Narrative) (Details) R$ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2010 BRL (R$)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 BRL (R$) site	Jun. 30, 2024 USD ($) site	Sep. 30, 2023 USD ($)
Disputed energy management charges
Loss Contingencies [Line Items]
Gain from Litigation Settlement		$ 7,700,000	$ 7,700,000
Alleged Anticompete Litigation
Loss Contingencies [Line Items]
Civil fines imposed	R$ 179.2		32,000,000
Provision for litigation			$ 0
Maximum of loss contingency range subject to interest				R$ 179.2	$ 32,000,000
Environmental
Loss Contingencies [Line Items]
Approximate number of sites on which settlement has not been reached | site				27	27
Accrual for environmental loss contingencies					$ 59,800,000	$ 64,500,000
Accrual for environmental loss contingencies, maximum payout period				26 years	26 years
Environmental | Minimum
Loss Contingencies [Line Items]
Estimate of possible exposure from environmental loss contingencies					$ 59,000,000
Environmental | Maximum
Loss Contingencies [Line Items]
Estimate of possible exposure from environmental loss contingencies					$ 73,000,000