Revenue recognition (Tables)

9 Months Ended

Sep. 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 September 30, 2019						Three Months Ended September 30, 2018
	U.S. Government		Non-U.S. Government		Total		U.S. Government		Non-U.S. Government		Total
Product sales	$	170.2	$	86.0	$	256.2	$	127.3	$	6.0	$	133.3
Contract manufacturing	—		20.0		20.0		—		22.1		22.1
Contracts and grants	35.6		—		35.6		16.7		1.5		18.2
Total revenues	$	205.8	$	106.0	$	311.8	$	144.0	$	29.6	$	173.6

	Nine Months Ended September 30, 2019						Nine Months Ended September 30, 2018
	U.S. Government		Non-U.S. Government		Total		U.S. Government		Non-U.S. Government		Total
Product sales	$	338.1	$	254.6	$	592.7	$	363.2	$	25.9	$	389.1
Contract manufacturing	—		54.6		54.6		—		72.0		72.0
Contracts and grants	94.3		4.1		98.4		46.7		3.9		50.6
Total revenues	$	432.4	$	313.3	$	745.7	$	409.9	$	101.8	$	511.7

Rollforward of Contract Liabilities

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

December 31, 2018	$	73.1
Prepayments	34.6
Revenue recognized	(18.1		)
September 30, 2019	$	89.6

Schedule of Accounts Receivable, Net

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

	September 30, 2019		December 31, 2018
Billed, net	$	251.4	$	234.0
Unbilled	29.8		28.5
Total, net	$	281.2	$	262.5