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Business Combinations - Decision Resource Group Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 10 Months Ended
Oct. 01, 2020
Feb. 28, 2020
Jan. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Business Acquisition [Line Items]            
Total consideration       $ 0 $ 0  
Decision Resources Group            
Business Acquisition [Line Items]            
Percentage of ownership   100.00%        
Total consideration   $ 964,997,000        
Cash   900,000,000        
Adjusted closing cash   6,100,000        
Contingent consideration   $ 58,897,000   86,029,000    
Increase in contingent consideration       (24,410,000)    
Transaction costs       $ 24,383,000 19,762,000  
Newly issued ordinary shares (in shares)   2,895,638   2,895,638    
Goodwill purchase accounting adjustments           $ 1,804,000
Pro forma expense increase (decrease)         (24,926,000)  
Goodwill deductible amount   $ 0        
CPA Global            
Business Acquisition [Line Items]            
Percentage of ownership 100.00%          
Total consideration $ 8,643,561,000          
Cash 2,078,084,000          
Transaction costs       $ 525,000 $ 0  
Newly issued ordinary shares (in shares)       1,500,000    
Goodwill purchase accounting adjustments       $ (8,121,000)    
Goodwill deductible amount $ 0          
Value of stock issued     $ 43,890,000      
CPA Global | Maximum            
Business Acquisition [Line Items]            
Newly issued ordinary shares (in shares) 218,306,663          
DRG            
Business Acquisition [Line Items]            
Newly issued ordinary shares (in shares)       2,895,638    
Value of stock issued       $ 61,619,000