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Stockholders' equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Stockholders' Equity Note [Abstract]            
Dividends declared on common stock $ 214,450 $ 214,600 $ 209,300 $ 193,623 $ 638,351 $ 573,894
Dividends declared on common stock (per share) $ 1.24 $ 1.24 $ 1.21 $ 1.18   $ 3.51
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax $ (8,395)     $ (12,874) $ (4,172) $ (17,431)
Shares of common stock authorized 400,000,000       400,000,000  
Shares of common stock issued and outstanding 171,000,000       171,000,000  
Shares of preferred stock authorized 100,000,000       100,000,000  
Shares of preferred stock issued and outstanding 0       0  
Number of "excess stock" authorized (in shares) 200,000,000       200,000,000  
Number of excess stock authorized issued and outstanding (in shares) 0       0