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Fair Value Measurements (Details) - USD ($) $ in Millions	May 31, 2019	Aug. 31, 2018	May 31, 2018	Aug. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 333.7	$ 129.1
Liabilities:
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	333.7	129.1	$ 94.3	$ 311.1
Carrying Value | Senior unsecured public notes, net of unamortized discount and deferred costs
Liabilities:
Carrying and estimated fair values of financial instruments	349.8	349.5
Carrying Value | Industrial revenue bond | Industrial Revenue Bond Maturing in 2021
Liabilities:
Carrying and estimated fair values of financial instruments	4.0	4.0
Carrying Value | Bank loans
Liabilities:
Carrying and estimated fair values of financial instruments	2.8	3.3
Fair Value | Level 2 | Senior unsecured public notes, net of unamortized discount and deferred costs
Liabilities:
Carrying and estimated fair values of financial instruments	355.1	361.7
Fair Value | Level 2 | Industrial revenue bond | Industrial Revenue Bond Maturing in 2021
Liabilities:
Carrying and estimated fair values of financial instruments	4.0	4.0
Fair Value | Level 2 | Bank loans
Liabilities:
Carrying and estimated fair values of financial instruments	$ 3.0	$ 3.3

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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.

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