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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax expense in discontinued operations	$ 2.8
Income tax expense in continued operations	3.4	$ 0.7	$ 13.1	$ 14.4
Corrections
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax expense in discontinued operations	2.7
Income tax expense in continued operations	2.5
Immaterial errors
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accrued Income Taxes	$ 0.2		$ 0.2

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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