Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020	May 31, 2021
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 31.1		$ 31.1		$ 34.2
Effective tax rate	18.00%	13.30%	14.50%	10.50%