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Acquisitions - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 19, 2017
Mar. 31, 2017
Feb. 24, 2017
Feb. 16, 2017
Jan. 21, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]                    
Transaction costs           $ 1.4 $ 2.7      
Net cash purchase price               $ 109.8 $ 6.2  
Interest expense           28.5 $ 31.5 56.9 $ 63.5  
Current portion of escrow           8.6   8.6   $ 4.1
Escrow deposit           11.0   11.0   $ 6.3
Arium Limited                    
Business Acquisition [Line Items]                    
Consideration transferred         $ 1.9          
Percentage of voting interests acquired         100.00%          
Healix International Holdings Limited                    
Business Acquisition [Line Items]                    
Consideration transferred       $ 52.4            
Indemnification escrow       $ 7.5            
Percentage of voting interests acquired       100.00%            
Net cash purchase price               52.4    
Emergent Network Intelligence Limited                    
Business Acquisition [Line Items]                    
Consideration transferred     $ 6.1              
Indemnification escrow     $ 0.5              
Percentage of voting interests acquired     100.00%              
Fintellix Solutions Private Limited                    
Business Acquisition [Line Items]                    
Consideration transferred   $ 16.9                
Indemnification escrow   $ 1.8                
Percentage of voting interests acquired   100.00%                
Net cash purchase price               $ 16.9    
MAKE Consulting A/S                    
Business Acquisition [Line Items]                    
Consideration transferred $ 16.9                  
Indemnification escrow $ 2.6                  
Percentage of voting interests acquired 100.00%                  
Aerial Imagery Acquisitions                    
Business Acquisition [Line Items]                    
Consideration transferred           28.1        
Holdback amount           $ 3.0