Accounts Receivable (Tables)

6 Months Ended

Nov. 30, 2019

Accounts Receivable

Schedule of accounts receivable

	November 30,		May 31,
	2019		2019
U.S. Government contracts:
Trade receivables	$	32.7	$	28.7
Unbilled receivables		29.8		31.7
		62.5		60.4
All other customers:
Trade receivables		99.8		92.5
Unbilled receivables		46.2		44.9
		146.0		137.4
	$	208.5	$	197.8