Business Segment Information - Reconciliation of Segment Gross Profit to Income (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Reconciliation of segment gross profit to income from continuing operations before provision for income taxes
Segment gross profit	$ 370.1	$ 313.2	$ 275.9
Provision for credit losses	(2.6)	(1.2)	(8.5)
Selling, general and administrative	(230.4)	(202.2)	(182.4)
Earnings (Loss) from joint ventures	(3.2)	(2.9)	0.2
Losses related to sale and exit of business	(0.7)	(1.7)	(20.2)
Other income (expenses), net	(0.8)	2.2	4.3
Interest expense	(12.2)	(2.4)	(5.0)
Interest income	1.0	0.1	0.2
Income from continuing operations before provision for income taxes	$ 121.2	$ 105.1	$ 64.5