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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)