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Accounts Receivable (Tables)
6 Months Ended
Nov. 30, 2020
Accounts Receivable  
Schedule of accounts receivable

November 30,

May 31,

    

2020

    

2020

U.S. Government contracts:

 

  

 

  

Trade receivables

$

30.4

$

33.9

Unbilled receivables

 

25.6

 

27.4

 

56.0

 

61.3

All other customers:

 

  

 

  

Trade receivables

 

88.9

 

81.7

Unbilled receivables

 

24.9

 

28.9

 

113.8

 

110.6

$

169.8

$

171.9