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Background information - Narrative (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended
Aug. 07, 2026
USD ($)
Mar. 25, 2026
$ / shares
Jun. 30, 2026
USD ($)
series
Jul. 16, 2026
USD ($)
debenture
$ / shares
Background Information (Details) [Line Items]        
Payment of dividends (in dollars per share) | $ / shares   $ 1.00    
Number of receivable certificates | series     4  
Receivable certificates     $ 102,400  
Gain (loss) arising from difference between carrying amount of financial liability extinguished and consideration paid     171,600  
Write-off of previously capitalized issuance cost     36,600  
Expenses from allocation of premiums paid to reinsurer     133,600  
Tender offer, expense     $ 1,400  
Danantara Investment Management        
Background Information (Details) [Line Items]        
Proportion of ownership interest in joint venture 25.00%      
Commitment to invest in joint venture $ 2,500,000      
Investments in joint ventures reported in separate financial statements $ 800,000      
Non-adjusting events after reporting period        
Background Information (Details) [Line Items]        
Debt instruments issued, number of bonds | debenture       400,000
Price per debenture (in dollars per share) | $ / shares       $ 193,000
Debenture amount       $ 77,300