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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Income tax expense in discontinued operations	$ (0.7)	$ 3.8	$ (0.9)	$ 11.2
Income tax expense in continued operations	$ 6.9	4.7	$ 19.1	13.8
Immaterial errors
Accrued Income Taxes		0.2		$ 0.2
Changes in estimates associated with tax provisions to federal income tax return filing differences
Income tax expense in discontinued operations		2.8
Corrections
Income tax expense in discontinued operations		1.7
Income tax expense in continued operations		$ 1.5

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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