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Accounts Receivable (Tables)
9 Months Ended
Feb. 29, 2020
Accounts Receivable  
Schedule of accounts receivable

February 29,

May 31,

    

2020

    

2019

U.S. Government contracts:

Trade receivables

$

40.4

$

28.7

Unbilled receivables

 

30.5

 

31.7

 

70.9

 

60.4

All other customers:

Trade receivables

 

117.3

 

92.5

Unbilled receivables

 

37.5

 

44.9

 

154.8

 

137.4

$

225.7

$

197.8