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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     $ (175,553)  
Total other comprehensive income (loss) net of tax $ (311,828) $ (188,207) (669,661) $ (345,497)
Ending balance, Accumulated other comprehensive income (845,214)   (845,214)  
Other (income) expense, net (3,062) 579 (42,369) (16,732)
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     (170,500) 298,600
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (654,400) (347,500)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0 0
Other Comprehensive Income (Loss), Tax     1,100 400
Total other comprehensive income (loss) net of tax     (653,300) (347,100)
Ending balance, Accumulated other comprehensive income (823,800) (48,500) (823,800) (48,500)
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     (10,900) (26,000)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     1,400 1,700
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (200) (2,600)
Other Comprehensive Income (Loss), Tax     (500) (500)
Total other comprehensive income (loss) net of tax     1,100 3,800
Ending balance, Accumulated other comprehensive income (9,800) (22,200) (9,800) (22,200)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (income) expense, net (100) (1,000) (200) (2,600)
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     5,800 9,800
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (23,300) (2,700)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (600) 100
Other Comprehensive Income (Loss), Tax     5,300 700
Total other comprehensive income (loss) net of tax     (17,400) (2,100)
Ending balance, Accumulated other comprehensive income (11,600) 7,700 (11,600) 7,700
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (income) expense, net 200 0 600 (100)
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     (175,600) 282,400
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (676,300) (348,500)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (800) (2,500)
Other Comprehensive Income (Loss), Tax     5,900 600
Total other comprehensive income (loss) net of tax     (669,600) (345,400)
Ending balance, Accumulated other comprehensive income $ (845,200) $ (63,000) $ (845,200) $ (63,000)