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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Ordinary Shares
Additional Paid-in Capital
Other Undenominated Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Beginning balance (in shares) at Dec. 31, 2021   81,554,683        
Beginning balance at Dec. 31, 2021 $ 8,066,827 $ 6,640 $ 6,733,910 $ 1,134 $ (90,937) $ 1,416,080
Comprehensive income (net of tax):            
Net income 505,304         505,304
Currency translation adjustment (89,530)       (89,530)  
Remeasurement of retirement benefit obligations 12,657       12,657  
Gain on cash flow hedge (3,728)       (3,728)  
Total comprehensive income 424,703          
Exercise of share options (in shares)   348,286        
Exercise of share options 35,828 $ 21 35,807      
Issue of restricted share units / performance share units (in shares)   241,116        
Issue of restricted share units / performance share units 16 $ 16        
Share based compensation expense 70,606   70,606      
Share issuance costs (17)   (17)      
Share repurchase program, number of shares repurchased (in shares)   (420,530)        
Repurchase of ordinary shares (99,983) $ (28)   28   (99,983)
Share repurchase costs (17)          
Ending balance (in shares) at Dec. 31, 2022   81,723,555        
Ending balance at Dec. 31, 2022 8,497,963 $ 6,649 6,840,306 1,162 (171,538) 1,821,384
Comprehensive income (net of tax):            
Net income 612,335         612,335
Currency translation adjustment 26,221       26,221  
Remeasurement of retirement benefit obligations 244       244  
Gain on cash flow hedge 1,567       1,567  
Total comprehensive income 640,367          
Exercise of share options (in shares)   535,705        
Exercise of share options 50,958 $ 35 50,923      
Issue of restricted share units / performance share units (in shares)   235,826        
Issue of restricted share units / performance share units 15 $ 15        
Share based compensation expense 51,456   51,456      
Share issuance costs $ (16)   (16)      
Ending balance (in shares) at Dec. 31, 2023 82,495,086 82,495,086        
Ending balance at Dec. 31, 2023 $ 9,240,743 $ 6,699 6,942,669 1,162 (143,506) 2,433,719
Comprehensive income (net of tax):            
Net income 791,474         791,474
Currency translation adjustment (84,927)       (84,927)  
Remeasurement of retirement benefit obligations (6,077)       (6,077)  
Gain on cash flow hedge 4,581       4,581  
Total comprehensive income 705,051          
Exercise of share options (in shares)   311,040        
Exercise of share options 36,178 $ 20 36,158      
Issue of restricted share units / performance share units (in shares)   130,433        
Issue of restricted share units / performance share units 9 $ 9        
Share based compensation expense 41,426   41,426      
Share issuance costs (22)   (22)      
Share repurchase program, number of shares repurchased (in shares)   (2,179,699)        
Repurchase of ordinary shares (499,998) $ (142)   142   (499,998)
Share repurchase costs $ (388)          
Ending balance (in shares) at Dec. 31, 2024 80,756,860 80,756,860        
Ending balance at Dec. 31, 2024 $ 9,522,999 $ 6,586 $ 7,020,231 $ 1,304 $ (229,929) $ 2,724,807