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Acquisitions (Details Numeric) - USD ($)
$ in Millions
1 Months Ended
Dec. 19, 2016
Sep. 20, 2018
TubeMogul    
Business Acquisition    
Business Combination Purchase Price $ 560.8  
Purchase price allocation, goodwill 348.4  
Purchase price allocation, identifiable intangible assets 113.1  
Purchase price allocation, net assets (liabilities) acquired (assumed) $ 99.3  
Subsequent Event [Member] | Marketo    
Business Acquisition    
Business Combination Purchase Price   $ 4,750.0