Financial Instruments and Risk Management - Narrative (Details)	3 Months Ended			9 Months Ended
	Jun. 30, 2023 USD ($) derivative_instrument Contract	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2023 USD ($) derivative_instrument Contract	Jun. 30, 2022 USD ($)	Feb. 28, 2023	Sep. 30, 2022 USD ($)	Jan. 22, 2021 USD ($)	Dec. 22, 2020 USD ($)
Derivative [Line Items]
Unrecognized pre-tax loss			$ (86,400,000)	$ 77,100,000
Portion or pre-tax gain included in AOCI expected to be included in earnings	$ 2,900,000			2,900,000
Secured Overnight Financing Rate (SOFR) | Interest Rate Contracts
Derivative [Line Items]
Fixed interest rate						1.042%
Interest Rate Contracts
Derivative [Line Items]
Notional value	$ 550,000,000.0			$ 550,000,000.0				$ 700,000,000.0	$ 550,000,000.0
Notional value decrease each year								$ 100,000,000.0
Fixed interest rate	0.95%			0.95%					0.95%
Line of Credit | Senior Secured Term Loan B Facility, net of discount, due 2022
Derivative [Line Items]
Face amount of debt	$ 1,007,000,000			$ 1,007,000,000
Estimate of Fair Value
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,065,300,000			2,065,300,000			$ 1,795,700,000
Reported Value Measurement
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,384,100,000			2,384,100,000			2,337,100,000
Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Derivatives - Foreign Currency contracts	66,600,000			66,600,000			96,600,000
Designated as Hedging Instrument | Cash Flow Hedging | Zinc contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	$ (7,500,000)			$ (7,500,000)			(6,100,000)
Derivative, Number of Open Contracts | Contract	18			18
Notional value	$ 52,000,000			$ 52,000,000
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	(3,000,000.0)			(3,000,000.0)			16,300,000
Notional value	$ 180,000,000			$ 180,000,000
Number of open contracts | derivative_instrument	68			68
Not Designated as Hedging Instrument | Foreign currency contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	$ (800,000)			$ (800,000)			$ (600,000)
Gain (Loss) Recognized in Income	(1,600,000)	$ 1,900,000		(1,000,000.0)	$ 5,300,000
Not Designated as Hedging Instrument | Foreign currency contracts
Derivative [Line Items]
Notional value	$ 73,000,000			$ 73,000,000
Number of open contracts | derivative_instrument	6			6