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Shareholders' Equity - Components of Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2022
Jun. 30, 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 $ 8,983,231 $ 8,289,545 $ 7,906,889 $ 7,820,925 $ 7,213,156 $ 6,791,203 $ 7,906,889 $ 6,791,203
Net income 128,547 324,999 249,209 102,411 296,754 217,678 702,755 616,843
Other comprehensive income (loss) 159,631 121,723 (45,947) (79,232) 137,939 60,121 $ 235,407 118,828
Cash dividends (95,312) (93,533) (90,411) (81,912) (80,325) (79,023)    
Public and other stock offerings 84,660 336,469 265,861 3,830 248,960 220,009    
Stock-based compensation plans $ 7,414 4,028 3,944 7,736 4,441 3,168    
Common stock outstanding, ending balance (in shares) 139,888,756           139,888,756  
Shareholders' equity, ending balance $ 9,268,171 $ 8,983,231 $ 8,289,545 $ 7,773,758 $ 7,820,925 $ 7,213,156 $ 9,268,171 $ 7,773,758
Cash dividends per share (USD per share) $ 0.68 $ 0.68 $ 0.68 $ 0.625 $ 0.625 $ 0.625 $ 2.04 $ 1.875
Common stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock outstanding, beginning balance (in shares) 139,012,029 135,425,081 132,419,754 130,667,109 128,152,961 125,882,477 132,419,754 125,882,477
Shareholders' equity, beginning balance $ 695 $ 677 $ 662 $ 653 $ 641 $ 629 $ 662 $ 629
Public and other stock offerings (in shares) 801,952 3,509,116 2,730,115 39,078 2,498,026 2,126,118    
Public and other stock offerings $ 4 $ 18 $ 13 $ 1 $ 12 $ 11    
Stock-based compensation plans (in shares) 74,775 77,832 275,212 80,852 16,122 144,366    
Stock-based compensation plans     $ 2     $ 1    
Common stock outstanding, ending balance (in shares) 139,888,756 139,012,029 135,425,081 130,787,039 130,667,109 128,152,961 139,888,756 130,787,039
Shareholders' equity, ending balance $ 699 $ 695 $ 677 $ 654 $ 653 $ 641 $ 699 $ 654
Additional Paid-in Capital                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shareholders' equity, beginning balance 5,634,020 5,293,541 5,023,751 4,853,703 4,600,314 4,377,149 5,023,751 4,377,149
Public and other stock offerings 84,656 336,451 265,848 3,829 248,948 219,998    
Stock-based compensation plans 7,414 4,028 3,942 7,736 4,441 3,167    
Shareholders' equity, ending balance 5,726,090 5,634,020 5,293,541 4,865,268 4,853,703 4,600,314 5,726,090 4,865,268
Accumulated Other Comprehensive Income (Loss)                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shareholders' equity, beginning balance 145,579 23,856 69,803 140,471 2,532 (57,589) 69,803 (57,589)
Other comprehensive income (loss) 159,631 121,723 (45,947) (79,232) 137,939 60,121    
Shareholders' equity, ending balance 305,210 145,579 23,856 61,239 140,471 2,532 305,210 61,239
Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shareholders' equity, beginning balance 3,202,937 2,971,471 2,812,673 2,826,098 2,609,669 2,471,014 2,812,673 2,471,014
Net income 128,547 324,999 249,209 102,411 296,754 217,678    
Cash dividends (95,312) (93,533) (90,411) (81,912) (80,325) (79,023)    
Shareholders' equity, ending balance $ 3,236,172 $ 3,202,937 $ 2,971,471 $ 2,846,597 $ 2,826,098 $ 2,609,669 $ 3,236,172 $ 2,846,597