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Fair Value Measurements (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 28, 2021 USD ($) investment | Feb. 28, 2022 USD ($) | Feb. 28, 2021 USD ($) | Aug. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 475.5 |  | $ 491.3
Asset impairment | $ 4.0 | 1.7 | $ 4.0 |
Number of equity instruments | investment | 1 |  |  |
Reported Value Measurement |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments |  | 9.9 |  | 5.3
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 |  | $ 461.3 |  | $ 496.5

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