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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

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