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Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2018
Jan. 31, 2018
Pragmatix    
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]    
Equity method investment, ownership (as a percent)   100.00%
Subsequent Event | Kensho    
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]    
Consideration transferred to acquire business $ 550