Treasury Stock (Tables)

6 Months Ended

Nov. 30, 2017

Stockholders' Equity Attributable to Parent [Abstract]

Tabular Disclosure of an Entity's Treasury Stock

The table below represents the current Board authorization:

	Amount
July 2015	50.0
Less repurchases made under the authorization as of November 30, 2017	(24.7		)
Remaining Board authorization at November 30, 2017	$	25.3