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Acquisitions and Divestitures (Details) - USD ($) $ in Millions			3 Months Ended
	Aug. 31, 2018	Jun. 07, 2018	Nov. 30, 2019	Aug. 31, 2019	Sep. 01, 2018	Sep. 30, 2019
Business Acquisition [Line Items]
Document Period End Date				Aug. 31, 2019
Payments to Acquire Intangible Assets				$ 0.0	$ 4.8
Contingent Equity Method Purchase				33.00%
MAARS
Business Acquisition [Line Items]
Percentage of voting interests acquired	48.20%
Purchase price	$ 6.1
HAY
Business Acquisition [Line Items]
Percentage of voting interests acquired		33.00%
Purchase price		$ 65.5
Payments to Acquire Intangible Assets		$ 4.8
HAY | Subsequent Event
Business Acquisition [Line Items]
Percentage of voting interests acquired						34.00%
Purchase price			$ 78.0

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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Contingent Equity Method Purchase

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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