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Accounts Receivable (Details) - USD ($)
$ in Millions
Nov. 30, 2022
May 31, 2022
Accounts Receivable    
Total accounts receivable $ 225.3 $ 214.0
U.S. Government Contracts    
Accounts Receivable    
Trade receivables 21.6 31.6
Unbilled receivables 32.1 25.9
Total accounts receivable 53.7 57.5
All other customers    
Accounts Receivable    
Trade receivables 155.1 136.8
Unbilled receivables 16.5 19.7
Total accounts receivable $ 171.6 $ 156.5