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Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Aug. 31, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 891.2	$ 776.2	$ 824.2	$ 834.7	$ 938.1	$ 947.6	$ 854.4	$ 932.6	$ 3,326.3	$ 3,672.7	$ 3,680.1
Independent sales network
Disaggregation of Revenue [Line Items]
Net sales									2,442.9	2,519.2
Direct sales network
Disaggregation of Revenue [Line Items]
Net sales									311.0	381.0
Retail sales
Disaggregation of Revenue [Line Items]
Net sales									214.9	270.3
Corporate accounts
Disaggregation of Revenue [Line Items]
Net sales									193.6	314.2
Other
Disaggregation of Revenue [Line Items]
Net sales									$ 163.9	$ 188.0

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