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Accounts Receivable (Tables)
3 Months Ended
Aug. 31, 2020
Accounts Receivable  
Schedule of accounts receivable

August 31,

May 31,

    

2020

    

2020

U.S. Government contracts:

Trade receivables

$

36.1

$

33.9

Unbilled receivables

 

33.4

 

27.4

 

69.5

 

61.3

All other customers:

Trade receivables

 

77.7

 

81.7

Unbilled receivables

 

19.5

 

28.9

 

97.2

 

110.6

$

166.7

$

171.9