Revenue recognition (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The Company's revenues disaggregated by the major sources were as follows:

	Three Months Ended June 30, 2019						Three Months Ended June 30, 2018
	U.S. Government		Non-U.S. Government		Total		U.S. Government		Non-U.S. Government		Total
Product sales	$	94.6	$	88.9	$	183.5	$	169.9	$	10.2	$	180.1
Contract manufacturing	—		18.7		18.7		—		23.6		23.6
Contracts and grants	38.3		2.7		41.0		15.3		1.2		16.5
Total revenues	$	132.9	$	110.3	$	243.2	$	185.2	$	35.0	$	220.2

	Six months ended June 30, 2019						Six Months Ended June 30, 2018
	U.S. Government		Non-U.S. Government		Total		U.S. Government		Non-U.S. Government		Total
Product sales	$	167.9	$	168.6	$	336.5	$	235.9	$	19.9	$	255.8
Contract manufacturing	—		34.6		34.6		—		49.8		49.8
Contracts and grants	58.7		4.1		62.8		30.1		2.3		32.4
Total revenues	$	226.6	$	207.3	$	433.9	$	266.0	$	72.0	$	338.0

Rollforward of Contract Liabilities

The following table presents the rollforward of deferred revenue contract liability balances:

December 31, 2018	$	73.1
Deferral of revenue	23.8
Revenue recognized	(7.4		)
June 30, 2019	$	89.5

Schedule of Accounts Receivable, Net

Accounts receivable including unbilled accounts receivable contract assets consist of the following:

	June 30, 2019		December 31, 2018
Billed, net	$	179.5	$	234.0
Unbilled	38.6		28.5
Total, net	$	218.1	$	262.5