Related Party Transactions - Schedule of reconciliation of total net transfers to and from the parent to the corresponding amount presented in the consolidated and combined statement of cash flows (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Related Party Transaction [Line Items]
Less: depreciation expense allocated from the Former Parent			$ 32.5	$ 33.3
Stock-based compensation			5.3	6.1
Former Parent
Related Party Transaction [Line Items]
Total net transfers from/(to) the Former Parent per consolidated and combined changes in equity	$ 0.0	$ (84.9)	0.0	(44.1)
Less: depreciation expense allocated from the Former Parent	0.0	0.6	0.0	1.2
Stock-based compensation	0.0	3.3	0.0	6.1
Total net transfers from/(to) the Former Parent per consolidated and combined statement of cash flows	$ 0.0	$ (88.8)	$ 0.0	$ (51.4)