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Financial Instruments and Risk Management - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) derivative_instrument Contract	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) derivative_instrument Contract	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Apr. 01, 2019 USD ($)	Feb. 28, 2018 USD ($)	Mar. 31, 2017 USD ($)
Derivative [Line Items]
Unrecognized pre-tax loss			$ (3,900,000)		$ (7,700,000)
Unrealized pre-tax gain			1,300,000		4,300,000
Portion or pre-tax gain included in AOCI expected to be included in earnings	$ 1,500,000		1,500,000
Gain (Loss) Recognized in Income	(900,000)	$ 9,900,000	8,100,000	$ 9,900,000
Interest Rate Contracts
Derivative [Line Items]
Notional value	400,000,000.0		400,000,000.0			$ 50,000,000.0	$ 400,000,000.0
Forward interest rate							2.47%
Line of Credit | Senior Secured Term Loan B Facility, net of discount, due 2022
Derivative [Line Items]
Face amount of debt	1,075.0		1,075.0
Estimate of Fair Value
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,493,400,000		2,493,400,000		599,200,000
Long-term debt held in escrow					1,274,400,000
Reported Value Measurement
Derivative [Line Items]
Fair market value of fixed rate long-term debt	600,000,000.0		600,000,000.0
Long-term debt held in escrow	2,439,200,000		2,439,200,000		1,254,200,000
Senior Secured Term Loan B Facility due 2022 | Senior Secured Term Loan B Facility, net of discount, due 2022 | Interest Rate Contracts
Derivative [Line Items]
Variable rate debt hedged								$ 200,000,000.0
Fixed interest rate								2.03%
Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Derivatives - Foreign Currency contracts	(3,300,000)		(3,300,000)		$ 12,000,000.0
Designated as Hedging Instrument | Cash Flow Hedging | Zinc contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	$ (700,000)		$ (700,000)
Derivative, Number of Open Contracts | Contract	4		4
Notional value	$ 16,000,000		$ 16,000,000
Designated as Hedging Instrument | Cash Flow Hedging | Foreign Exchange Forward
Derivative [Line Items]
Notional value	$ 140,000,000		$ 140,000,000
Number of open contracts | derivative_instrument	64		64
Not Designated as Hedging Instrument | Foreign Exchange Forward
Derivative [Line Items]
Notional value	$ 206,000,000		$ 206,000,000
Number of open contracts | derivative_instrument	10		10

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