v3.25.4

Financial Instruments and Risk Management - Narrative (Details)	3 Months Ended	6 Months Ended
	Dec. 31, 2025 USD ($) derivative_instrument Contract	Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Dec. 22, 2024 USD ($)	Feb. 22, 2023	Jan. 22, 2021 USD ($)
Derivative [Line Items]
Portion or pre-tax gain included in AOCI expected to be included in earnings	$ (2,800,000)
Unrecognized pre-tax loss	21,000,000.0	$ (25,300,000)
Interest Rate Contracts
Derivative [Line Items]
Fixed interest rate					1.042%
Notional value decrease each year				$ 100,000,000.0
Notional value	500,000,000.0					$ 500,000,000.0
Line of Credit | Senior Secured Term Loan B Facility, net of discount, due 2022
Derivative [Line Items]
Face amount of debt	766,200,000
Estimate of Fair Value
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,459,700,000		$ 2,473,500,000
Reported Value Measurement
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,538,300,000		2,537,700,000
Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Derivatives - Foreign Currency contracts	20,700,000		22,900,000
Designated as Hedging Instrument | Cash Flow Hedging | Zinc contracts
Derivative [Line Items]
Notional value	30,000,000
Derivatives - Foreign Currency contracts	$ 2,600,000		1,500,000
Derivative, number of open contracts | Contract	16
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Notional value	$ 97,000,000
Derivatives - Foreign Currency contracts	$ (2,900,000)		(3,900,000)
Number of open contracts | derivative_instrument	46
Not Designated as Hedging Instrument | Foreign currency contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	$ 200,000		$ (500,000)
Not Designated as Hedging Instrument | Foreign currency contracts
Derivative [Line Items]
Notional value	$ 134,000,000
Number of open contracts | derivative_instrument	8

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