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Debt and Lines of Credit - Debt (Details) - USD ($) $ in Millions	Aug. 31, 2021	Nov. 10, 2020	Aug. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 494.3		$ 401.1
Senior Unsecured Notes | Unsecured public notes due December 2030
Debt Instrument [Line Items]
Debt outstanding	500.0		0.0
Senior unsecured public notes due December 2030, unamortized discount and deferred costs	(5.7)		0.0
Unsecured Term Loan | Borrowings under Term Loan Facility
Debt Instrument [Line Items]
Total debt	0.0		395.0
Unsecured Term Loan | 2.150% Senior Unsecured Notes Due December 2030 | ABL
Debt Instrument [Line Items]
Total debt	494.3
Debt instrument, face amount		$ 500.0
Industrial Revenue Bond | Industrial revenue bond
Debt Instrument [Line Items]
Total debt	0.0		4.0
Bank loans | Fixed-rate Bank Loans
Debt Instrument [Line Items]
Total debt	$ 0.0		$ 2.1

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