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Earnings (Loss) Per Share | 6 Months Ended
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Nov. 30, 2021
Earnings Per Share [Abstract] |
Earnings (Loss) Per Share | EARNINGS (LOSS) PER SHARE The following table summarizes the reconciliation of the numerators and denominators for the basic and diluted earnings (loss) per share computation for the periods indicated:
| Three months ended | Six months ended
| November 30, | November 30,
| 2021 | 2020 | 2021 | 2020
Net income (loss) attributable to Class A and Common Stockholders | $ | 68.0 |  |  | $ | 35.1 |  |  | $ | 43.9 |  |  | $ | (4.7) |
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions) |  | 34.6 |  |  |  | 34.3 |  |  |  | 34.6 |  |  | 34.3 |
Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans (in millions) * |  | 1.0 |  |  |  | 0.1 |  |  |  | 0.9 |  |  |  | — |  |
Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions) |  | 35.6 |  |  |  | 34.4 |  |  |  | 35.5 |  |  | 34.3 |
Earnings (loss) per share of Class A Stock and Common Stock: |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 1.97 |  |  | $ | 1.02 |  |  | $ | 1.27 |  |  | $ | (0.14) |
Diluted | $ | 1.91 |  |  | $ | 1.02 |  |  | $ | 1.24 |  |  | $ | (0.14) |
* The Company experienced a net loss for the six month period ended November 30, 2020 and therefore did not report any dilutive share impact. Net income (loss) attributable to Class A and Common Stockholders excludes earnings of $0.3 and less than $0.1 for the three month periods ended November 30, 2021 and November 30, 2020, respectively, and $0.2 for the six month period ended November 30, 2021, for earnings attributable to participating restricted stock units. The Company experienced a loss for the six month period ended November 30, 2020 and therefore did not allocate any loss to certain participating restricted stock units. The following table sets forth options outstanding pursuant to stock-based compensation plans as of the dates indicated:
| November 30, 2021 |  | November 30, 2020
Options outstanding pursuant to stock-based compensation plans (in millions) | 4.9 |  |  | 5.2 |
There were 1.7 million of potentially anti-dilutive shares pursuant to stock-based compensation plans as of November 30, 2021. A portion of the Company’s Restricted Stock Units ("RSUs"), which are granted to employees, participate in earnings through cumulative dividends. These dividends are payable and non-forfeitable to the employees upon vesting of the RSUs. Accordingly, the Company measures earnings per share based upon the lower of the Two-class method or the Treasury Stock method. As of November 30, 2021, $63.1 remained available for future purchases of common shares under the repurchase authorization of the Board of Directors (the "Board") in effect on that date. See Note 11, Treasury Stock, for a more complete description of the Company’s share buy-back program.

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