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Non-current bank credit lines and loan facilities - Narrative (Details)
2 Months Ended 4 Months Ended 12 Months Ended
Dec. 29, 2021
USD ($)
Sep. 27, 2021
USD ($)
Jul. 01, 2021
USD ($)
Dec. 08, 2020
USD ($)
tranche
Dec. 31, 2021
USD ($)
Nov. 09, 2021
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Total financing costs             $ 182,423,000 $ 13,019,000 $ 13,276,000
Cash paid for interest             106,205,000 $ 13,062,000 $ 13,059,000
Issue of senior notes, number of tranches | tranche       2          
Long-term debt at fair value         $ 5,507,200,000   5,507,200,000    
PRA Health Sciences, Inc                  
Debt Instrument [Line Items]                  
Total financing costs             $ 86,700,000    
Term loan | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (in percent)         2.75% 3.00% 2.50%    
Basis spread on variable rate, step down percentage (in percent)             0.25%    
First lien net leverage ratio         4   4    
Decrease in basis spread on variable rate         0.25%        
Term loan | London Interbank Offered Rate (LIBOR) | Maximum                  
Debt Instrument [Line Items]                  
First lien net leverage ratio         4.00   4.00    
Term loan | London Interbank Offered Rate (LIBOR) | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (in percent)             0.50%    
First lien net leverage ratio         1.00   1.00    
Senior secured revolving loan facility | Variable rate component one | Base rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (in percent)             0.60%    
Senior secured revolving loan facility | Variable rate component one | Base rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (in percent)             1.00%    
Senior secured revolving loan facility | Variable rate component one | Base rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (in percent)             0.25%    
Senior secured revolving loan facility | Variable rate component two | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (in percent)             1.60%    
Senior secured revolving loan facility | Variable rate component two | London Interbank Offered Rate (LIBOR) | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (in percent)             2.00%    
Senior secured revolving loan facility | Variable rate component two | London Interbank Offered Rate (LIBOR) | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (in percent)             1.25%    
Senior Secured Credit Facility | Senior secured credit facility and senior secured notes                  
Debt Instrument [Line Items]                  
Debt discount paid         $ 27,600,000   $ 27,600,000    
Senior Secured Credit Facility | Term loan                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 5,515,000,000            
Debt instrument, interest rate (in percent)     1.00%   2.75%   2.75%    
Repayments of senior debt $ 500,000,000 $ 13,800,000              
Cash paid for interest $ 40,800,000 $ 40,400,000              
Payments of Debt Restructuring Costs             $ 5,600,000    
Line of credit | Senior secured revolving loan facility | Revolving loan facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity     $ 300,000,000            
Long-term line of credit         $ 0   0    
Letter of credit | Senior secured revolving loan facility | Revolving loan facility                  
Debt Instrument [Line Items]                  
Letters of credit outstanding amount         $ 4,100,000   $ 4,100,000    
Senior Secured Notes | Senior Secured Notes                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     $ 500,000,000            
Debt instrument, interest rate (in percent)     2.875%   2.875%   2.875%    
Senior Notes | Senior Notes 2020                  
Debt Instrument [Line Items]                  
Proceeds from issuance of long-term debt       $ 350,000,000          
Effective interest rate (in percent)             2.41%    
Repayments of debt     $ 364,000,000            
Senior Notes | Series A notes                  
Debt Instrument [Line Items]                  
Debt instrument, face amount       $ 275,000,000          
Debt instrument, interest rate (in percent)       2.32%          
Senior Notes | Series B notes                  
Debt Instrument [Line Items]                  
Debt instrument, face amount       $ 75,000,000          
Debt instrument, interest rate (in percent)       2.43%