Treasury Stock (Tables)

3 Months Ended

Aug. 31, 2018

Stockholders' Equity Attributable to Parent [Abstract]

Tabular Disclosure of an Entity's Treasury Stock

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

Authorizations	Amount
July 2015	$	50.0
March 2018	50.0
Total current Board authorizations	$	100.0
Less repurchases made under these authorizations	$	(38.6	)
Remaining Board authorization at August 31, 2018	$	61.4