Revenue Recognition - Contract Assets and Liabilities and Remaining Performance Obligations (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	May 31, 2023
Contract assets and liabilities
Contract assets - current	$ 99.3		$ 86.9
Contract assets - non-current	30.8		27.5
Contract liabilities:
Deferred revenue - current	(25.4)		(19.7)
Deferred revenue on long-term contracts	(11.7)		(12.7)
Net contract assets	93.0		$ 82.0
Change in contract assets - current	12.4
Change in contract assets - non-current	3.3
Change in contract liabilities - current	(5.7)
Change in contract liabilities - non-current	1.0
Change in net contract assets	11.0
Change in contract assets and revenue	12.3	$ 14.2
Changes in deferred revenue
Deferred revenue at beginning of period	(32.4)	(30.6)
Revenue deferred	(66.8)	(57.5)
Revenue recognized	61.1	53.5
Other	1.0	1.1
Deferred revenue at end of period	(37.1)	$ (33.5)
Remaining Performance Obligations
Remaining performance obligation	$ 810.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-03-01
Remaining Performance Obligations
Remaining performance obligation (as a percent)	55.00%
Expected timing of satisfaction of remaining performance obligation	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-03-01
Remaining Performance Obligations
Remaining performance obligation (as a percent)	45.00%
Expected timing of satisfaction of remaining performance obligation	3 years
PBH contracts
Contract liabilities:
Contract Charges on non-achievement of minimum volume guarantees	$ 8.1
PBH forward loss reserve	5.1
PBH contracts | Accrued liabilities
Contract liabilities:
PBH forward loss reserve	4.4
PBH contracts | Other long-term liabilities
Contract liabilities:
PBH forward loss reserve	$ 0.7