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Business Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Millions
Jan. 06, 2017
Nov. 10, 2016
Oct. 14, 2016
TIW Corporation      
Business Acquisition [Line Items]      
Stock purchase agreement, par value of common stock (in dollars per share)     $ 100.00
Purchase price as a result of business acquisition     $ 142.7
Acquisition costs     $ 2.5
Revenues   $ 49.4  
Pre-tax operating loss   15.5  
Net loss from business acquisition   $ 15.9  
Technology Alliance Inc.      
Business Acquisition [Line Items]      
Purchase price as a result of business acquisition $ 20.0    
Other Noncurrent Liabilities | OPT      
Business Acquisition [Line Items]      
Purchase price as a result of business acquisition $ 2.0