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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 10, 2014
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 04, 2014
Oct. 10, 2014
Dec. 31, 2013
Business Acquisition [Line Items]                
Purchase consideration     $ 0.0 $ 5.9        
Goodwill   $ 74.7 74.7   $ 89.5     $ 60.4
Decrease to goodwill from acquisition adjustments     14.9          
Apollo Group Limited [Member]                
Business Acquisition [Line Items]                
Contingent consideration, based on achievement of certain EBITDA targets $ 2.4 1.8 $ 1.8          
Contingent consideration, measurement period for EBITDA targets 2 years              
Contingent consideration, fair value at date of acquisition $ 1.1              
Purchase consideration $ 6.5              
Autoform and Apollo [Member]                
Business Acquisition [Line Items]                
Goodwill             $ 5.8  
Saet S.p.A [Member]                
Business Acquisition [Line Items]                
Goodwill           $ 23.2    
Decrease to goodwill from acquisition adjustments   15.0            
Technology-Based Intangible Assets [Member] | Saet S.p.A [Member]                
Business Acquisition [Line Items]                
Increase in intangible assets from acquisition adjustments   8.7            
Trade Names [Member] | Saet S.p.A [Member]                
Business Acquisition [Line Items]                
Increase in intangible assets from acquisition adjustments   $ 4.7