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Subsequent Events (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 26, 2018
Sep. 30, 2018
Sep. 30, 2018
Subsequent Event [Line Items]      
Proceeds from sale of equity method investments $ 55.0    
MediaMath, Inc.      
Subsequent Event [Line Items]      
Percent of ownership sold 39.13%    
Proceeds from sale of equity method investments $ 45.0    
Percent of ownership sold, repurchase option within 180 days 10.87%    
Repurchase option within 180 days $ 12.5    
Realized gain (loss) on disposal     $ 45.0
AdvantEdge Healthcare Solutions, Inc.      
Subsequent Event [Line Items]      
Proceeds from sale of equity method investments 10.0    
Realized gain (loss) on disposal   $ 5.5 $ 5.5
Additional amount receivable after certain valuation thresholds $ 6.3