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Shareholders' Equity - Components of Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock outstanding, beginning balance (in shares)   132,419,754     132,419,754  
Shareholders' equity, beginning balance $ 8,289,545 $ 7,906,889 $ 7,213,156 $ 6,791,203 $ 7,906,889 $ 6,791,203
Net income 324,999 249,209 296,754 217,678 574,208 514,432
Other comprehensive income (loss) 121,723 (45,947) 137,939 60,121 $ 75,776 198,060
Cash dividends (93,533) (90,411) (80,325) (79,023)    
Public and other stock offerings 336,469 265,861 248,960 220,009    
Stock-based compensation plans $ 4,028 3,944 4,441 3,168    
Common stock outstanding, ending balance (in shares) 139,012,029       139,012,029  
Shareholders' equity, ending balance $ 8,983,231 $ 8,289,545 $ 7,820,925 $ 7,213,156 $ 8,983,231 $ 7,820,925
Cash dividends per share (USD per share) $ 0.68 $ 0.68 $ 0.625 $ 0.625 $ 1.36 $ 1.25
Common stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock outstanding, beginning balance (in shares) 135,425,081 132,419,754 128,152,961 125,882,477 132,419,754 125,882,477
Shareholders' equity, beginning balance $ 677 $ 662 $ 641 $ 629 $ 662 $ 629
Public and other stock offerings (in shares) 3,509,116 2,730,115 2,498,026 2,126,118    
Public and other stock offerings $ 18 $ 13 $ 12 $ 11    
Stock-based compensation plans (in shares) 77,832 275,212 16,122 144,366    
Stock-based compensation plans $ 0 $ 2 $ 0 $ 1    
Common stock outstanding, ending balance (in shares) 139,012,029 135,425,081 130,667,109 128,152,961 139,012,029 130,667,109
Shareholders' equity, ending balance $ 695 $ 677 $ 653 $ 641 $ 695 $ 653
Additional Paid-in Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shareholders' equity, beginning balance 5,293,541 5,023,751 4,600,314 4,377,149 5,023,751 4,377,149
Public and other stock offerings 336,451 265,848 248,948 219,998    
Stock-based compensation plans 4,028 3,942 4,441 3,167    
Shareholders' equity, ending balance 5,634,020 5,293,541 4,853,703 4,600,314 5,634,020 4,853,703
Accumulated Other Comprehensive Income (Loss)            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shareholders' equity, beginning balance 23,856 69,803 2,532 (57,589) 69,803 (57,589)
Other comprehensive income (loss) 121,723 (45,947) 137,939 60,121    
Shareholders' equity, ending balance 145,579 23,856 140,471 2,532 145,579 140,471
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shareholders' equity, beginning balance 2,971,471 2,812,673 2,609,669 2,471,014 2,812,673 2,471,014
Net income 324,999 249,209 296,754 217,678    
Cash dividends (93,533) (90,411) (80,325) (79,023)    
Shareholders' equity, ending balance $ 3,202,937 $ 2,971,471 $ 2,826,098 $ 2,609,669 $ 3,202,937 $ 2,826,098