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Fair Value Measurement - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 11 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2015
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Recurring basis | Level 3              
Fair Value Measurement              
Amount of final earn-out consideration received $ 0.6            
Gain on final earn-out consideration received $ 0.1            
Assets measured at fair value   $ 0.5   $ 0.0 $ 0.0 $ 0.5  
Contingent consideration receivable              
Fair Value Measurement              
Consideration in contingent nature (as a percent)             40.00%
Period to calculate and remit remaining consideration             60 days
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       0.5  
Security Business | Discontinued Operations, Disposed of by Sale              
Fair Value Measurement              
Period to calculate and remit remaining consideration       60 days      
Period of cash consideration to be received   18 months 18 months        
Contingent acquisition consideration | Level 3              
Fair Value Measurement              
Change in fair value         $ 0.0 $ 0.0 $ 0.2