Business Segment Information - Sales by Product and Services (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Net sales	$ 1,652.3	$ 2,072.0	$ 2,051.8
Aviation supply chain
Net sales	1,172.7	1,434.3	1,395.2
Maintenance, repair and overhaul services
Net sales	381.0	529.9	525.4
Mobility products
Net sales	$ 98.6	$ 107.8	$ 131.2