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Unaudited Condensed Consolidated Statements of Shareholders' Investment - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 1,857,074,747 $ 1,861,751,660 [1] $ 1,969,977,496 $ 2,049,518,261 $ 1,861,751,660 [1] $ 2,049,518,261
Issuance of common stock and the tax benefit of stock plan transactions 31,420,260 10,514,554 16,729,546 36,267,047    
Repurchases of common stock (in shares)         (7,800,000)  
Repurchases of common stock (69,871,143) (96,267,229) (146,633,543) (202,572,378)    
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock 5,276,201 4,862,947 4,675,468 3,977,471    
Impact of ASU 2016-01 adoption       0    
Dividends declared (29,299,410) (29,392,200) (29,581,544) (30,123,981)    
Net income (loss) 108,958,625 104,280,411 109,023,982 111,248,743 $ 213,239,036 220,272,725
Other comprehensive income (loss) 774,955 1,324,604 (2,692,093) 1,662,333    
Ending balance $ 1,904,334,235 $ 1,857,074,747 $ 1,921,499,312 $ 1,969,977,496 $ 1,904,334,235 $ 1,921,499,312
Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (in shares) 255,584,345 259,328,613 273,854,377 280,281,321 259,328,613 280,281,321
Beginning balance $ 15,335,060 $ 15,559,717 $ 16,431,263 $ 16,816,879 $ 15,559,717 $ 16,816,879
Issuance of common stock and the tax benefit of stock plan transactions (in shares) 2,269,483 980,670 1,353,561 2,904,555    
Issuance of common stock and the tax benefit of stock plan transactions $ 136,170 $ 58,840 $ 81,213 $ 174,274    
Repurchases of common stock (in shares) (3,074,709) (4,724,938) (6,284,817) (9,331,499)    
Repurchases of common stock $ (184,483) $ (283,497) $ (377,089) $ (559,890)    
Ending balance (in shares) 254,779,119 255,584,345 268,923,121 273,854,377 254,779,119 268,923,121
Ending balance $ 15,286,747 $ 15,335,060 $ 16,135,387 $ 16,431,263 $ 15,286,747 $ 16,135,387
Additional  Paid-In Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 748,641,461 745,324,144 742,491,728 723,510,672 745,324,144 723,510,672
Issuance of common stock and the tax benefit of stock plan transactions 31,284,090 10,455,714 16,648,333 36,092,773    
Repurchases of common stock (7,963,499) (12,001,344) (15,020,714) (21,089,188)    
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock 5,276,201 4,862,947 4,675,468 3,977,471    
Ending balance 777,238,253 748,641,461 748,794,815 742,491,728 777,238,253 748,794,815
Retained  Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 1,093,373,960 1,102,468,137 1,208,841,516 1,301,997,327 1,102,468,137 1,301,997,327
Repurchases of common stock (61,723,161) (83,982,388) (131,235,740) (180,923,300)    
Impact of ASU 2016-01 adoption       6,642,727    
Dividends declared (29,299,410) (29,392,200) (29,581,544) (30,123,981)    
Net income (loss) 108,958,625 104,280,411 109,023,982 111,248,743    
Ending balance 1,111,310,014 1,093,373,960 1,157,048,214 1,208,841,516 1,111,310,014 1,157,048,214
Accumulated  Other Comprehensive Income (Loss)            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (275,734) (1,600,338) 2,212,989 7,193,383 (1,600,338) 7,193,383
Impact of ASU 2016-01 adoption       (6,642,727)    
Other comprehensive income (loss) 774,955 1,324,604 (2,692,093) 1,662,333    
Ending balance $ 499,221 $ (275,734) $ (479,104) $ 2,212,989 $ 499,221 $ (479,104)
[1] The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.