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Debt and Lines of Credit - Long-term Debt (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 16, 2019	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Debt Instrument [Line Items]
Repayments of debt		$ 350.7	$ 0.4	$ 0.4
Total debt outstanding		401.1	356.6
Senior Unsecured Notes \| Unsecured public notes due December 2019
Debt Instrument [Line Items]
Repayments of debt	$ 350.0
Industrial Revenue Bond \| Industrial revenue bond
Debt Instrument [Line Items]
Total debt outstanding		$ 4.0	$ 4.0
Long-term debt interest rate (percent)		1.00%	1.70%
Bank loans \| Fixed-rate Bank Loans
Debt Instrument [Line Items]
Total debt outstanding		$ 2.1	$ 2.7
Bank loans \| Fixed-rate Bank Loans \| Minimum
Debt Instrument [Line Items]
Interest rate (percent)		0.80%
Bank loans \| Fixed-rate Bank Loans \| Maximum
Debt Instrument [Line Items]
Interest rate (percent)		2.00%