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Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance $ (66,013) $ (174,990) $ (188,436) $ (160,046)
Other comprehensive income before reclassifications 1,727 (94,103) (106,453) (88,961)
Amounts reclassified from accumulated other comprehensive income 79,520 133 93,763 (9,669)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 77,793 94,236 200,216 79,292
Ending Balance 11,780 (80,754) 11,780 (80,754)
Income Tax Expense (Benefit) (1,241) (867) (4,030) (767)
Realized Investment Gains (Losses) 507 (577) 507 3,959
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (7,176) (23,344) (21,136) (20,197)
Other comprehensive income before reclassifications (25,646) (36,788) (25,949) (38,148)
Amounts reclassified from accumulated other comprehensive income (20,357) (9) (6,700) (4,516)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 5,289 36,779 19,249 33,632
Ending Balance (1,887) 13,435 (1,887) 13,435
Realized Investment Gains (Losses) (6,362) 1,497 12,108 (2,651)
Accumulated Translation Adjustment [Member]        
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (58,314) (150,537) (166,191) (144,035)
Other comprehensive income before reclassifications 27,373 (57,315) (80,504) (50,813)
Amounts reclassified from accumulated other comprehensive income 99,354 0 99,354 0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 71,981 57,315 179,858 50,813
Ending Balance 13,667 (93,222) 13,667 (93,222)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]        
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (523) (1,109) (1,109) (753)
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income 523 142 1,109 (214)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 523 142 1,109 (214)
Ending Balance 0 (967) 0 (967)
Other Postretirement Benefits Plan [Member]        
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance 0 0 0 4,939
Other comprehensive income before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income 0 0 0 (4,939)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0 0 0 (4,939)
Ending Balance 0 0 0 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Income Tax Expense (Benefit) 962 (1,506) (3,851) (1,865)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]        
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Income Tax Expense (Benefit)     (179)  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other Postretirement Benefits Plan [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 0 0 0 0
Changes In Accumulated Other Comprehensive Income [Roll Forward]        
Amounts reclassified from accumulated other comprehensive income 0 0 0 (4,939)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 0 0 0 0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 0 0 0 (4,939)
Income Tax Expense (Benefit) $ 0 $ 0 $ 0 $ 0