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Fair Value Measurement - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Recurring basis | Level 3      
Fair Value Measurement      
Assets measured at fair value   $ 0.5 $ 0.0
Contingent consideration receivable      
Fair Value Measurement      
Consideration in contingent nature (as a percent) 40.00%    
Contingent consideration receivable | Level 3      
Fair Value Measurement      
Period of contingent consideration receivable 18 months    
Contingent consideration receivable | Recurring basis | Level 3      
Fair Value Measurement      
Assets measured at fair value   $ 0.5  
Security Business | Discontinued Operations, Disposed of by Sale      
Fair Value Measurement      
Period of cash consideration to be received 18 months