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Commitments and contingencies - Revolving Credit Facility (Details) - Line of Credit
$ in Millions
1 Months Ended
Oct. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Oct. 31, 2023
USD ($)
Nov. 30, 2018
USD ($)
Revolving Credit Facility        
Commitments And Contingencies [Line Items]        
Maximum borrowing capacity $ 400.0   $ 500.0 $ 500.0
Term of borrowing agreement 5 years      
Commitment fee rate 0.15%      
Ration of consolidated net debt to EBITDA (no greater than) 3.50      
Future ratio of consolidated net debt to EBITDA (no greater than) 4.00      
Remaining borrowing capacity   $ 500.0    
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)        
Commitments And Contingencies [Line Items]        
Base rate component, spread on variable rate 0.0010      
Basis spread on variable rate 1.50%      
Revolving Credit Facility | Alternative Base Rate        
Commitments And Contingencies [Line Items]        
Basis spread on variable rate 0.50%      
Revolving Credit Facility | Credit Agreement Amended And Restated        
Commitments And Contingencies [Line Items]        
Accordion feature maximum borrowings capacity $ 405.0   $ 305.0  
Letter of Credit        
Commitments And Contingencies [Line Items]        
Commitment fee 0.125%