Earnings (Loss) Per Share (Details) - Schedule of Earnings Per Share, Basic and Diluted (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Schedule of Earnings Per Share, Basic and Diluted [Abstract]
Earnings (loss) from continuing operations attributable to Class A and Common Shares (in Dollars)	$ (22.1)	$ (12.1)	$ 12.4	$ 16.1
Earnings (loss) from discontinued operations attributable to Class A and Common Shares, net of tax (in Dollars)	0	0	(0.2)	0.2
Net income (loss) attributable to Class A and Common Shares (in Dollars)	$ (22.1)	$ (12.1)	$ 12.2	$ 16.3
Weighted average Shares of Class A Stock and Common Stock outstanding for basic earnings (loss) per share (in millions) (in Shares)	32.7	32.0	32.6	31.9
Dilutive effect of Class A Stock and Common Stock potentially issuable pursuant to stock-based compensation plans (in millions) (in Shares)	0	0	0.6	0.5
Adjusted weighted average Shares of Class A Stock and Common Stock outstanding for diluted earnings (loss) per share (in millions) (in Shares)	32.7	32.0	33.2	32.4
Basic earnings (loss) per share:
Earnings (loss) from continuing operations	$ (0.68)	$ (0.38)	$ 0.38	$ 0.50
Earnings (loss) from discontinued operations, net of tax	$ 0.00	$ 0.00	$ (0.01)	$ 0.01
Net income (loss) (in Dollars per share)	$ (0.68)us-gaap_EarningsPerShareBasic	$ (0.38)us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per share:
Earnings (loss) from continuing operations	$ (0.68)	$ (0.38)	$ 0.37	$ 0.50
Earnings (loss) from discontinued operations, net of tax	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Net income (loss) (in Dollars per share)	$ (0.68)us-gaap_EarningsPerShareDiluted	$ (0.38)us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted

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This element represents the income or loss from continuing operations attributable to the common stockholders.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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