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Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 59.4	$ 57.5	$ 51.8
Total property, plant, and equipment, at cost	802.8	757.7
Less: Accumulated depreciation and amortization	(532.3)	(480.4)
Property, plant, and equipment, net	270.5	277.3
Land
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, at cost	22.2	22.6
Total property, plant, and equipment, at cost
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, at cost	192.2	190.7
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, at cost	$ 588.4	$ 544.4
Minimum | Total property, plant, and equipment, at cost
Property, Plant and Equipment [Line Items]
Useful lives of plant and equipment, minimum	10 years
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Useful lives of plant and equipment, minimum	3 years
Maximum | Total property, plant, and equipment, at cost
Property, Plant and Equipment [Line Items]
Useful lives of plant and equipment, minimum	40 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Useful lives of plant and equipment, minimum	15 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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