Treasury Stock (Tables)

9 Months Ended

Feb. 28, 2018

Stockholders' Equity Attributable to Parent [Abstract]

Tabular Disclosure of an Entity's Treasury Stock

The table below represents the Board authorization at the date indicated:

	Amount
July 2015	$	50.0
Less repurchases made under the authorization as of February 28, 2018	(36.6		)
Remaining Board authorization at February 28, 2018	$	13.4