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Goodwill - Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Balance at beginning of year $ 178.6 $ 177.4
Translation adjustments 2.2 1.2
Balance at end of year 180.8 178.6
Services    
Goodwill [Roll Forward]    
Balance at beginning of year 69.9 68.7
Translation adjustments 2.2 1.2
Balance at end of year 72.1 69.9
Technology    
Goodwill [Roll Forward]    
Balance at beginning of year 108.7 108.7
Translation adjustments 0.0 0.0
Balance at end of year $ 108.7 $ 108.7