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Taxes - Schedule of provision for income taxes (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Current      
Federal $ 6.3 $ 3.4 $ 26.4
State and local 1.3 1.2 1.6
Non-United States 2.7 1.5 1.6
Total Current 10.3 6.1 29.6
Deferred Income Taxes and Tax Credits [Abstract]      
Federal (9.1) 0.5 (6.6)
State and local (0.4) (1.3) 3.9
Non-United States (0.2) (1.2) (1.0)
Total Deferred (9.7) (2.0) (3.7)
Total provision (benefit) for income taxes $ 0.6 $ 4.1 $ 25.9