Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481549/505-30-45-1

Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions	10 Months Ended	12 Months Ended
	May 31, 2024	May 31, 2024	May 31, 2023	May 31, 2022	Mar. 20, 2024	Dec. 13, 2023	Jul. 19, 2023
Equity, Class of Treasury Stock [Line Items]
Total current Board authorizations	$ 220.8	$ 220.8
Purchases of treasury stock at cost	(134.2)	(156.8)	$ (135.1)	$ (33.4)
Remaining Board authorization at May 31, 2024	$ 86.6	$ 86.6
Board Authorized 2020 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Total current Board authorizations					$ 54.6	$ 66.2	$ 100.0