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Income Taxes - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Valuation allowance for deferred tax assets $ 45,495,000 $ 32,768,000 $ 27,700,000
Net change in the total valuation allowance 12,800,000 5,100,000  
Deferred tax liabilities, undistributed foreign earnings 800,000 900,000  
Unrecognized tax benefit, potentially expire in 2021 38,800,000    
Total unrecognized tax benefits net of potential benefits 202,100,000 19,100,000 20,200,000
Interest and penalties recognized as an expense 1,900,000 600,000 $ 0
Total accrued interest and penalties 15,500,000 500,000  
PRA Health Sciences, Inc      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Net change in the total valuation allowance 9,300,000    
Provision for income taxes      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Net change in the total valuation allowance 4,400,000 3,600,000  
Other Comprehensive Income      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Net change in the total valuation allowance 900,000 $ 1,500,000  
Foreign Country      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Other non-U.S subsidiaries operating loss carryforwards for income tax 42,300,000    
Foreign Country | Tax Year 2022 to 2028      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Additional operating loss carryforward 19,900,000    
Foreign Country | Tax Year 2029 to 2038      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Additional operating loss carryforward 19,900,000    
Ireland | Foreign Country      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Ireland subsidiaries additional tax credit carryforward for income tax 14,000,000    
United States      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
U.S. Federal net operating loss carry forwards currently available for offset 5,000,000    
Alternative minimum tax credit carry forwards 800,000    
United States | Federal NOL's      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Net operating loss carryforwards 10,349,000    
U.S. federal net operating loss carry forwards 10,300,000    
Tax credit carry forward 145,700,000    
Other non-U.S subsidiaries operating loss carryforwards for income tax 95,000    
United States | Tax Year 2022 to 2035 | Federal NOL's      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
U.S. federal net operating loss carry forwards 10,200,000    
Additional operating loss carryforward 10,238,000    
United States | Tax Year 2036-2040 | Federal NOL's      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
U.S. federal net operating loss carry forwards 100,000    
Additional operating loss carryforward 16,000    
United States | State NOL's      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Net operating loss carryforwards 296,981,000    
Other non-U.S subsidiaries operating loss carryforwards for income tax 44,370,000    
United States | State NOL's | Tax Year 2022 to 2035      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Additional operating loss carryforward 227,538,000    
United States | State NOL's | Tax Year 2036-2040      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Additional operating loss carryforward 25,073,000    
Other | Foreign Country      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Ireland subsidiaries additional tax credit carryforward for income tax $ 5,300,000