Revenue recognition (Tables)

12 Months Ended

Dec. 31, 2018

For the year ended December 31, 2018, the Company's revenues disaggregated by the major sources was as follows:

(in millions)	Year Ended December 31, 2018
	U.S			Non-U.S.
	Government			Government			Total

Product sales		$	526.1		$	80.4		$	606.5
Contract manufacturing			—			98.9			98.9
Contracts and grants			71.5			5.5			77.0
Total revenues		$	597.6		$	184.8		$	782.4

Accounts Receivable, Net

Accounts receivable

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

	December 31,
(in millions)	2018			2017
Billed, net		$	234.0		$	118.9
Unbilled			28.5			24.8
Total, net		$	262.5		$	143.7

Rollforward of Contract Liabilities

Contract liabilities

When performance obligations are not transferred to a customer at the end of a reporting period, the amount allocated to those performance obligations are reflected as deferred revenue on the consolidated balance sheets and are deferred until control of these performance obligations is transferred to the customer. The following table presents the rollforward of deferred revenue contract liabilities:

(in millions)
Balance at December 31, 2017	$	30.5
Adoption of new accounting standard (ASC 606)		42.4
Balance at January 1, 2018		72.9
Deferral of revenue		29.3
Recognition of revenue included in beginning of year contract liability		(29.1	)
Balance at December 31, 2018	$	73.1