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Earnings (Loss) Per Share (Tables) | 6 Months Ended
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Nov. 30, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table summarizes the reconciliation of the numerators and denominators for the basic and diluted earnings (loss) per share computation for the three and six-month periods ended November 30, 2013 and 2012, respectively:
|  | Three months ended November 30, |  |  | Six months ended November 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Earnings (loss) from continuing operations attributable to Class A and Common Shares |  | $ | 58.2 |  |  | $ | 62.4 |  |  | $ | 28.1 |  |  | $ | 30.8 |
Earnings (loss) from discontinued operations attributable to Class A and Common Shares, net of tax |  |  | 0.0 |  |  |  | (0.8 | ) |  |  | 0.2 |  |  |  | (1.2 | )
Net income (loss) attributable to Class A and Common Shares |  | $ | 58.2 |  |  | $ | 61.6 |  |  | $ | 28.3 |  |  | $ | 29.6 |
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions) |  |  | 31.9 |  |  |  | 31.9 |  |  |  | 31.8 |  |  |  | 31.7 |
Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans (in millions) |  |  | 0.4 |  |  |  | 0.8 |  |  |  | 0.6 |  |  |  | 0.7 |
Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions) |  |  | 32.3 |  |  |  | 32.7 |  |  |  | 32.4 |  |  |  | 32.4 |
Earnings (loss) per share of Class A Stock and Common Stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations |  | $ | 1.82 |  |  | $ | 1.95 |  |  | $ | 0.88 |  |  | $ | 0.97 |
Earnings (loss) from discontinued operations, net of tax |  | $ | 0.00 |  |  | $ | (0.02 | ) |  | $ | 0.01 |  |  | $ | (0.04 | )
Net income (loss) |  | $ | 1.82 |  |  | $ | 1.93 |  |  | $ | 0.89 |  |  | $ | 0.93 |
Diluted earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations |  | $ | 1.80 |  |  | $ | 1.91 |  |  | $ | 0.87 |  |  | $ | 0.95 |
Earnings (loss) from discontinued operations, net of tax |  | $ | 0.00 |  |  | $ | (0.02 | ) |  | $ | 0.01 |  |  | $ | (0.04 | )
Net income (loss) |  | $ | 1.80 |  |  | $ | 1.89 |  |  | $ | 0.88 |  |  | $ | 0.91 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table sets forth Options outstanding pursuant to stock-based compensation plans as of the dates indicated:
|  | November 30, 2013 |  |  | November 30, 2012 |
Options outstanding pursuant to stock-based compensation plans (in millions) |  |  | 4.7 |  |  |  | 4.3 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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