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Accounts Receivable (Tables)
9 Months Ended
Feb. 28, 2021
Accounts Receivable  
Schedule of accounts receivable

February 28,

May 31,

    

2021

    

2020

U.S. Government contracts:

 

  

 

  

Trade receivables

$

38.4

$

33.9

Unbilled receivables

 

18.7

 

27.4

 

57.1

 

61.3

All other customers:

 

 

  

Trade receivables

 

108.9

 

81.7

Unbilled receivables

 

20.8

 

28.9

 

129.7

 

110.6

$

186.8

$

171.9