Fair Value Measurements (Details) $ in Millions	3 Months Ended
Feb. 28, 2023 investment	May 31, 2023 USD ($)	Aug. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		$ 359.3	$ 223.2
Number of strategic investments whose underlying Company was acquired by a third party \| investment	1
Short-term borrowings outstanding		0.0	18.0
Line of Credit \| Credit facility \| The Credit Agreement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term borrowings outstanding		0.0	18.0
Approximate fair value of short term borrowings		0.0	18.0
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		9.5	11.9
Estimate of Fair Value Measurement \| Unsecured debt \| 2.150% Senior Unsecured Notes Due December 2030
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying and estimated fair values of financial instruments		$ 401.4	$ 399.2

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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