Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Current
Federal	$ 25.3	$ 26.9	$ 30.2
State and local	6.3	4.2	5.1
Foreign	13.4	7.6	5.1
Subtotal	45.0	38.7	40.4
Deferred
Federal	4.7	(8.6)	12.2
State and local	(0.8)	(0.6)	1.1
Foreign	(2.8)	(0.5)	0.3
Subtotal	1.1	(9.7)	13.6
Total	$ 46.1	$ 29.0	$ 54.0