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Fair Value Measurements (Details) - USD ($) $ in Millions	Feb. 28, 2021	Aug. 31, 2020
Fair Value Disclosures [Abstract]
Cash and cash equivalents	$ 498.7	$ 560.7
Carrying Value
Liabilities:
Investments in unconsolidated affiliates	5.5	6.0
Carrying Value | Unsecured debt | Senior unsecured public notes, net of unamortized discount and deferred costs
Liabilities:
Carrying and estimated fair values of financial instruments	494.0	0.0
Carrying Value | Unsecured debt | Unsecured Delayed Draw Term Loan
Liabilities:
Carrying and estimated fair values of financial instruments	0.0	395.0
Carrying Value | Industrial revenue bond | Industrial Revenue Bond Maturing in 2021 [Member]
Liabilities:
Carrying and estimated fair values of financial instruments	4.0	4.0
Carrying Value | Bank loans | Bank loans
Liabilities:
Carrying and estimated fair values of financial instruments	0.0	2.1
Fair Value
Liabilities:
Investments in unconsolidated affiliates	5.5	6.0
Fair Value | Unsecured debt | Senior unsecured public notes, net of unamortized discount and deferred costs
Liabilities:
Carrying and estimated fair values of financial instruments	490.8	0.0
Fair Value | Unsecured debt | Unsecured Delayed Draw Term Loan
Liabilities:
Carrying and estimated fair values of financial instruments	0.0	395.0
Fair Value | Industrial revenue bond | Industrial Revenue Bond Maturing in 2021 [Member]
Liabilities:
Carrying and estimated fair values of financial instruments	4.0	4.0
Fair Value | Bank loans | Bank loans
Liabilities:
Carrying and estimated fair values of financial instruments	$ 0.0	$ 2.3

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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