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Commitments and contingencies - Commitments (Details) - Revolving Credit Facility
1 Months Ended
May 31, 2023
Aug. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
Commitments      
Aggregate principal amount   $ 500,000,000  
Increase in maximum revolving commitments   $ 250,000,000  
Consolidated leverage ratio   0.25  
Debt instrument, floor interest rate 0    
Letters of credit outstanding, amount     $ 0
Long-term debt     $ 0
Minimum      
Commitments      
Commitment fee   0.15%  
Maximum      
Commitments      
Commitment fee   0.225%  
Base Rate | Minimum      
Commitments      
Interest rate margin   0.125%  
Base Rate | Maximum      
Commitments      
Interest rate margin   0.875%  
Eurodollar | Minimum      
Commitments      
Interest rate margin   1.125%  
Eurodollar | Maximum      
Commitments      
Interest rate margin   1.875%  
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate      
Commitments      
Interest rate margin 0.10%