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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive loss | $ (336,038) | $ (466,822) |
Other comprehensive income, net of tax | 130,784 | (291,269) | $ (458,009)
Foreign currency translation adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive loss | (334,100) | (466,500) | (170,500)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 132,900 | (296,300) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 |
Other Comprehensive Income (Loss), Tax | (500) | 300 |
Other comprehensive income, net of tax | 132,400 | (296,000) |
Other Postretirement Benefit Plan [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive loss | (2,800) | 10,000 | (10,900)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (13,100) | 25,400 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 700 | 100 |
Other Comprehensive Income (Loss), Tax | (400) | (4,600) |
Other comprehensive income, net of tax | (12,800) | 20,900 |
Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive loss | 900 | (10,300) | 5,800
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 13,400 | (21,500) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,200 | 600 |
Other Comprehensive Income (Loss), Tax | (3,400) | 4,800 |
Other comprehensive income, net of tax | 11,200 | (16,100) |
Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Accumulated other comprehensive loss | (336,000) | (466,800) | $ (175,600)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 133,200 | (292,400) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,900 | 700 |
Other Comprehensive Income (Loss), Tax | (4,300) | 500 |
Other comprehensive income, net of tax | $ 130,800 | $ (291,200) |

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