Summary of Significant Accounting Policies - Contract Assets and Liabilities and Remaining Performance Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Contract assets and liabilities
Contract assets - current	$ 86.9	$ 73.6
Contract assets - non-current	27.5	22.5
Deferred revenue - current	(19.7)	(20.5)
Deferred revenue on long-term contracts	(12.7)	(10.1)
Net contract assets	82.0	65.5
Change in contract assets - current	13.3
Change in contract assets - non-current	5.0
Change in contract liabilities - current	0.8
Change in contract liabilities - non-current	(2.6)
Change in net contract assets	16.5
Changes in deferred revenue
Deferred revenue at beginning of period	(30.6)	(31.3)
Revenue deferred	(267.0)	(259.0)
Revenue recognized	(257.8)	(242.3)
Other	7.4	17.4
Deferred revenue at end of period	(32.4)	(30.6)	$ (31.3)
Remaining Performance Obligations
Remaining performance obligation	$ 740.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-06-01
Remaining Performance Obligations
Remaining performance obligation (as a percent)	45.00%
Expected timing of satisfaction of remaining performance obligation	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-06-01
Remaining Performance Obligations
Remaining performance obligation (as a percent)	75.00%
Expected timing of satisfaction of remaining performance obligation	3 years
PBH contracts
Contract assets and liabilities
Contract Charges on non-achievement of minimum volume guarantees	$ 1.9	1.7	4.5
Customer contract termination and restructuring costs		$ 5.2	$ 5.7
PBH forward loss reserve	5.1
Charge to increase obligation reflecting revised estimated shortfall on minimum volume guarantee	4.5
PBH contracts | Accrued liabilities [Member]
Contract assets and liabilities
PBH forward loss reserve	4.3
PBH contracts | Other Noncurrent Liabilities [Member]
Contract assets and liabilities
PBH forward loss reserve	$ 0.8