Derivatives - Summary of Location and Fair Values of Derivative Instruments (Details) - USD ($) $ in Millions		Mar. 31, 2023	Sep. 30, 2022
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Natural Gas Commodity Hedge [Member]
Derivative [Line Items]
Derivative Liability	[1]	$ 32.3	$ 12.0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Current	Other Liabilities, Current
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset			$ 3.4
Derivative Asset, Statement of Financial Position [Extensible Enumeration]			Other Assets, Current

[1] At September 30, 2022, liability positions by counterparty were partially offset by $2.3 million of asset positions where we had an enforceable right of netting.