Significant Accounting Policies - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	Aug. 31, 2021	Aug. 31, 2020
Other Current Liabilities [Line Items]
Customer incentive programs	$ 33.9	$ 27.7
Current deferred revenues	7.7	5.4
Sales commissions	28.9	26.5
Freight costs	17.6	11.7
Warranty and recall costs	16.8	13.8
Tax-related items	11.7	12.7
Interest on long-term debt	2.4	1.0
Other	42.4	30.8
Total other current liabilities	189.5	160.6
Non-current deferred revenues	56.7	53.6
Customers with Rights of Return, Cash Discounts and Other Credits
Other Current Liabilities [Line Items]
Refunds to customers	$ 28.1	$ 31.0