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Consolidated Statement of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 872,439 $ 861,297 $ 777,933
Foreign currency translation:      
Translation adjustments 64,521 23,692 (72,112)
Change in long-term intercompany notes 16,695 (5,999) (16,569)
Net investment hedge instruments gain (loss), net of tax of $14,787, $581 and ($12,384) in 2020, 2019 and 2018, respectively (45,716) (1,803)  
Net investment hedge instruments gain (loss), net of tax of $14,787, $581 and ($12,384) in 2020, 2019 and 2018, respectively     38,452
Defined benefit pension plans:      
Net actuarial loss, net of tax of $8,637, $767 and ($18,825) in 2020, 2019 and 2018, respectively (18,733) (10,522) (75,253)
Amortization of net actuarial loss, net of tax of ($3,539), ($3,505) and ($2,716) in 2020, 2019 and 2018, respectively 11,940 12,180 9,313
Amortization of prior service costs, net of tax of $7, ($83) and $1,154 in 2020, 2019 and 2018, respectively (36) 401 (5,639)
Unrealized holding gain (loss) on available-for-sale securities:      
Unrealized gain (loss), net of tax 0 0 (104)
Other comprehensive income (loss) 28,671 17,949 (121,912)
Total comprehensive income $ 901,110 $ 879,246 $ 656,021