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Discontinued Operations - Revenues (Details) - Discontinued Operations - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 0.1	$ 0.1
Operating costs and expenses	0.3	1.0
Interest income (expense)	0.0	0.0
Earnings (loss) before income taxes	(0.2)	(0.9)
Provision (benefit) for income taxes	(0.1)	(0.4)
Earnings (loss) from discontinued operations, net of tax	$ (0.1)	$ (0.5)

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- Definition

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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