Derivative, Number of Open Contracts

No definition available.

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- Definition

Long-term Debt, Held in Escrow, Fair Value Disclosure

+ References

No definition available.

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- Definition

Long-term Debt, Percentage Bearing Fixed Interest, Fair Value Amount

+ References

No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

+ Details

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

Stated rate on an interest rate forward or futures contract.

+ References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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- Definition

Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

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Financial Instruments and Risk Management - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) derivative_instrument Contract	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) derivative_instrument Contract	Mar. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Apr. 01, 2019 USD ($)	Feb. 28, 2018 USD ($)	Mar. 31, 2017 USD ($)
Derivative [Line Items]
Unrecognized pre-tax loss			$ 500,000		$ (7,700,000)
Unrealized pre-tax gain			3,600,000		4,300,000
Portion or pre-tax gain included in AOCI expected to be included in earnings	$ 3,500,000		3,500,000
Gain Recognized in Income	0	$ 0	9,000,000.0	$ 0
Interest Rate Contracts
Derivative [Line Items]
Notional value	400,000,000.0		400,000,000.0				$ 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	1,150.0		1,150.0
Estimate of Fair Value
Derivative [Line Items]
Fair market value of fixed rate long-term debt	2,470,400,000		2,470,400,000		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	2,429,200,000		2,429,200,000		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	4,300,000		4,300,000		$ 12,000,000.0
Designated as Hedging Instrument \| Cash Flow Hedging \| Zinc contracts
Derivative [Line Items]
Derivatives - Foreign Currency contracts	$ 200,000		$ 200,000
Derivative, Number of Open Contracts \| Contract	1		1
Notional value	$ 7,000,000		$ 7,000,000
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign Exchange Forward
Derivative [Line Items]
Notional value	$ 136,000,000		$ 136,000,000
Number of open contracts \| derivative_instrument	64,000,000		64,000,000
Not Designated as Hedging Instrument \| Foreign Exchange Forward
Derivative [Line Items]
Notional value	$ 81,000,000		$ 81,000,000
Number of open contracts \| derivative_instrument	8		8
Scenario, Forecast \| Interest Rate Contracts
Derivative [Line Items]
Notional value						$ 50,000,000.0