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Accounts Receivable (Details) - USD ($)
$ in Millions
Feb. 28, 2023
May 31, 2022
Accounts Receivable    
Total accounts receivable $ 237.7 $ 214.0
U.S. Government contracts:    
Accounts Receivable    
Trade receivables 25.5 31.6
Unbilled receivables 18.2 25.9
Total accounts receivable 43.7 57.5
All other customers:    
Accounts Receivable    
Trade receivables 170.9 136.8
Unbilled receivables 23.1 19.7
Total accounts receivable $ 194.0 $ 156.5