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Commitments and Contingencies - Environmental contingencies (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014
South Brunswick, New Jersey [Member]
Site Contingency [Line Items]
Accrued expenses associated with remediation project	$ 2.6
Oakville, Connecticut [Member]
Site Contingency [Line Items]
Accrued expenses associated with remediation project	$ 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.

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