v3.26.1
Bank credit lines, loan facilities and notes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
May 08, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Nov. 26, 2025
May 02, 2023
Jul. 01, 2021
Debt Instrument [Line Items]              
Transaction related financing costs,   $ 5,980 $ 23,533 $ 16,402      
Estimated fair value of debt   3,500,100 3,469,200 3,793,500      
PRA Health Sciences, Inc              
Debt Instrument [Line Items]              
Transaction related financing costs,   $ 6,000 $ 23,500 $ 16,400      
The New Notes | Senior Subordinated Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount $ 2,000,000            
Debt discount paid 6,800            
Senior Secured Notes (the "2027 Notes") | Senior Subordinated Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount $ 750,000            
Debt instrument, interest rate (in percent) 5.809% 5.809% 5.809% 0.00%      
Debt instrument, discount rate on underwriting (in percent) 0.00250            
Senior Secured Notes (the "2029 Notes") | Senior Subordinated Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount $ 750,000            
Debt instrument, interest rate (in percent) 5.849% 5.849% 5.849% 0.00%      
Debt instrument, discount rate on underwriting (in percent) 0.00350            
Senior Secured Notes (the "2034 Notes") | Senior Subordinated Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount $ 500,000            
Debt instrument, interest rate (in percent) 6.00% 6.00% 6.00% 0.00%      
Debt discount paid $ 500            
Debt instrument, discount rate on underwriting (in percent) 0.00450            
Debt instrument, redemption price, percentage of principal amount redeemed 99.896%            
Senior Secured Term Loan | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   0.50%          
Senior Secured Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   2.00%          
Senior Secured Term Loan | Senior Secured Term Loan              
Debt Instrument [Line Items]              
Debt instrument, principal amount             $ 5,515,000
Debt instrument, interest rate (in percent)   5.672% 6.329% 7.86%     1.00%
Accelerated charge on repayments   $ 0 $ 16,900 $ 7,900      
Senior Secured Revolving Loan Facility              
Debt Instrument [Line Items]              
Long-term debt, term         7 years   5 years
Senior Secured Revolving Loan Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component Two | Standard & Poor's, BB Rating              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   1.35%          
Senior Secured Revolving Loan Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component Two | Standard & Poor's, BB+ Rating              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   1.00%          
Senior Secured Revolving Loan Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component Two | Standard & Poor's, BBB- Rating              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   0.75%          
Senior Secured Revolving Loan Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component Two | Standard & Poor's, BBB Rating              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   0.55%          
Senior Secured Revolving Loan Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Variable Rate Component Two | Standard & Poor's, BBB+ Rating              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   0.40%          
Senior Secured Revolving Loan Facility | Base rate | Maximum | Variable Rate Component One              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   0.35%          
Senior Secured Revolving Loan Facility | Base rate | Minimum | Variable Rate Component One              
Debt Instrument [Line Items]              
Basis spread on variable rate (in percent)   0.00%          
Senior Secured Revolving Loan Facility | Senior Secured Revolving Loan              
Debt Instrument [Line Items]              
Debt instrument, interest rate (in percent)   0.00% 0.00% 6.72%      
Senior Secured Revolving Loan Facility | Senior Secured Revolving Loan | Senior Secured Revolving Loan              
Debt Instrument [Line Items]              
Maximum borrowing capacity           $ 500,000 $ 300,000
Senior Secured Credit Facility and Senior Secured Notes | Senior Secured Term Loan              
Debt Instrument [Line Items]              
Debt discount paid             27,600
Senior Secured Notes (the “2026 Notes”) | Senior Subordinated Notes              
Debt Instrument [Line Items]              
Debt instrument, principal amount             $ 500,000
Debt instrument, interest rate (in percent)   2.875% 2.875% 2.875%     2.875%