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v3.20.2

Common Stock and Related Matters (Details) - USD ($) $ in Millions | 12 Months Ended | 30 Months Ended |
--- | --- | --- | ---
Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2020 | Mar. 31, 2018
Common Stock [Roll Forward] |  |  |  |  |
Common Stock, Balance beginning of period (in shares) | 53,778,155 |  |  |  |
Common Stock, Balance end of period (in shares) | 53,885,165 | 53,778,155 |  | 53,885,165 |
Common Stock, Amount (at par), Balance beginning of period | $ 0.5 |  |  |  |
Issuance of restricted stock grants, net of cancellations, Amount | 32.7 | $ 23.1 | $ 23.7 |  |
Stock options exercised, Amount | 0.1 |  | $ 1.1 |  |
Common Stock, Amount (at par), Balance end of period | $ 0.5 | $ 0.5 |  | $ 0.5 |
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] |  |  |  |  |
Remaining repurchased shares recorded as treasury stock | 15,012,449 | 14,325,197 |  | 15,012,449 |
Treasury stock at original repurchase cost | $ 1,227.2 | $ 1,156.0 |  | $ 1,227.2 |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Preferred stock authorized (in shares) | 50,000,000 | 50,000,000 |  | 50,000,000 |
Preferred stock, issued (in shares) | 0 | 0 |  | 0 |
Preferred stock, outstanding (in shares) | 0 | 0 |  | 0 |
March 2018 Repurchase Plan |  |  |  |  |
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract] |  |  |  |  |
Shares authorized for repurchase (shares) |  |  |  |  | 6,000,000
Reacquired shares of outstanding common stock | 700,000 |  |  | 2,100,000 |
Maximum number of shares that may yet be purchased under the program (shares) | 3,900,000 |  |  | 3,900,000 |
Amount |  |  |  |  |
Common Stock [Roll Forward] |  |  |  |  |
Common Stock, Balance beginning of period (in shares) | 53,800,000 | 53,700,000 | 53,500,000 |  |
Issuance of restricted stock grants, net of cancellations (in shares) | 100,000 | 100,000 | 200,000 |  |
Stock options exercised (in shares) | 0 |  | 0 |  |
Common Stock, Balance end of period (in shares) | 53,900,000 | 53,800,000 | 53,700,000 | 53,900,000 |
Common Stock, Amount (at par), Balance beginning of period | $ 0.5 | $ 0.5 | $ 0.5 |  |
Issuance of restricted stock grants, net of cancellations, Amount | 0.0 | 0.0 | 0.0 |  |
Stock options exercised, Amount | 0.0 |  | 0.0 |  |
Common Stock, Amount (at par), Balance end of period | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 |

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