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Acquisitions and Divestitures - Intralinks (Details) - USD ($)
3 Months Ended
Nov. 14, 2017
Jan. 19, 2017
Mar. 31, 2018
Mar. 31, 2017
Goldman Sachs Bank USA | 2017 Term Facility        
Acquisition        
Borrowing capacity   $ 900,000,000.0    
Total preliminary consideration transferred   815,000,000    
Proceeds from credit agreement   $ 900,000,000    
Impala | Intralinks Holdings, Inc.        
Acquisition        
Total preliminary cash consideration transferred $ 991,000,000      
Selling, general and administrative        
Acquisition        
Transaction costs     $ 700,000 $ 11,800,000