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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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

Treasury Stock (Details) - Schedule of repurchase of common stock - USD ($) shares in Millions, $ in Millions	12 Months Ended			38 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019	May 31, 2021	Mar. 18, 2020	Mar. 21, 2018
Equity, Class of Treasury Stock [Line Items]
Amount of stock repurchased in period		$ 35.5	$ 8.5
Board Authorized 2018 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Increase in Authorized Amount	$ 100.0			$ 100.0	$ 50.0	$ 50.0
Amount of stock repurchased in period				32.7
Remaining authorized repurchase amount	$ 67.3			$ 67.3
Shares of stock repurchased (in shares)	0.0