Commitments and Contingencies - Environmental contingencies (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Site Contingency [Line Items]
Estimated Litigation Period (in years)	5 years
South Brunswick, New Jersey
Site Contingency [Line Items]
Accrued expenses associated with remediation project	$ 2.4	$ 2.5
Oakville, Connecticut
Site Contingency [Line Items]
Accrual for Environmental Loss Contingencies	$ 0.1	$ 0.1

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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