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Goodwill (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Goodwill [Line Items]    
Goodwill $ 178.7 $ 180.8
Services    
Goodwill [Line Items]    
Goodwill 70.0 $ 72.1
Business process outsourcing services | Services    
Goodwill [Line Items]    
Goodwill $ 10.5