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Financial Instruments and Risk Management - Narrative (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2024 USD ($) derivative_instrument Contract	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 22, 2024 USD ($)	Sep. 30, 2024 USD ($)	Feb. 22, 2023	Jan. 22, 2021 USD ($)
Derivative [Line Items]
Unrecognized pre-tax loss	$ 44,800,000		$ (39,800,000)
Portion or pre-tax gain included in AOCI expected to be included in earnings	7,300,000
Gain (Loss) Recognized in Income	0	$ 1,000,000.0
Interest Rate Contracts
Derivative [Line Items]
Fixed interest rate						1.042%
Notional value	600,000,000.0						$ 600,000,000.0
Notional value decrease each year				$ 100,000,000.0
Line of Credit | Senior Secured Term Loan B Facility, net of discount, due 2022
Derivative [Line Items]
Face amount of debt	757,000,000.0
Estimate of Fair Value
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,246,000,000				$ 2,305,500,000
Reported Value Measurement
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,348,000,000				2,398,800,000
Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Derivatives - Foreign Currency contracts	53,900,000				39,200,000
Designated as Hedging Instrument | Cash Flow Hedging | Zinc contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	$ 1,400,000				4,000,000.0
Derivative, Number of Open Contracts | Contract	16
Notional value	$ 24,000,000
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	7,700,000				(4,600,000)
Notional value	$ 187,000,000
Number of open contracts | derivative_instrument	64
Not Designated as Hedging Instrument | Foreign currency contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	$ (3,100,000)				$ 2,900,000
Gain (Loss) Recognized in Income	(8,400,000)	$ 3,200,000
Not Designated as Hedging Instrument | Foreign currency contracts
Derivative [Line Items]
Notional value	$ 109,000,000
Number of open contracts | derivative_instrument	5

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