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Revenue recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 243.2	$ 220.2	$ 433.9	$ 338.0
U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues	132.9	185.2	226.6	266.0
Non-U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues	110.3	35.0	207.3	72.0
Product sales, net
Disaggregation of Revenue [Line Items]
Total revenues	183.5	180.1	336.5	255.8
Product sales, net | U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues	94.6	169.9	167.9	235.9
Product sales, net | Non-U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues	88.9	10.2	168.6	19.9
Contract manufacturing
Disaggregation of Revenue [Line Items]
Total revenues	18.7	23.6	34.6	49.8
Contract manufacturing | U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues	0.0	0.0	0.0	0.0
Contract manufacturing | Non-U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues	18.7	23.6	34.6	49.8
Contracts and grants
Disaggregation of Revenue [Line Items]
Total revenues	41.0	16.5	62.8	32.4
Contracts and grants | U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues	38.3	15.3	58.7	30.1
Contracts and grants | Non-U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues	$ 2.7	$ 1.2	$ 4.1	$ 2.3

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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