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Summary of Significant Accounting Policies - Treasury Stock (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Treasury Stocks      
Repurchase of shares $ 10.1 $ 5.1 $ 50.1
Shares repurchased (in shares) 0.2    
Restricted stock activity $ 6.4 10.2 8.9
Re-issuance of treasury stock upon exercise of stock options, net of shares withheld to satisfy statutory tax obligations $ 9.8 $ 24.6 $ 19.5
Federal statutory income tax rate (as a percent) 21.00% 21.00% 21.00%
Treasury Stock      
Treasury Stocks      
Total increase (decrease) in treasury stock $ 5.2 $ (20.3) $ 28.7
Repurchase of shares 10.1 $ 5.1 $ 50.1
Shares repurchased (in shares)   0.1 1.2
Restricted stock activity (1.7) $ 3.7 $ 2.2
Re-issuance of treasury stock upon exercise of stock options, net of shares withheld to satisfy statutory tax obligations $ 6.6 $ 21.7 $ 19.2