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Stockholders' Equity - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Nov. 06, 2025
$ / shares
Sep. 15, 2025
USD ($)
$ / shares
Sep. 05, 2025
USD ($)
$ / shares
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2024
shares
Nov. 30, 2021
USD ($)
Class of Stock [Line Items]                          
Stock repurchase program, authorized amount | $                         $ 4,000,000,000.00
Repurchased shares under authorization (in shares) | shares           0       0      
Stock repurchase program, remaining authorized repurchase amount | $           $ 1,560,000,000       $ 1,560,000,000      
Common stock held in treasury (in shares) | shares         39,292,311 37,977,550       37,977,550      
Preferred stock, liquidation preference (in dollars per share) | $ / shares         $ 1,000 $ 1,000       $ 1,000      
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.001 $ 0.001       $ 0.001      
Issuance of Series A Preferred Stock | $         $ 1,450,000,000                
Cumulative annual dividend rate (as a percentage)         7.50%                
Preferred stock cash dividend paid (in dollars per share) | $ / shares   $ 18.750                      
Payment of cash dividends on Series A Preferred Stock | $   $ 27,800,000               $ 52,900,000 $ 0    
Capped options indexed to equity, costs | $                   $ 0 $ 105,000,000.0    
Cash dividend paid (in dollars per share) | $ / shares     $ 0.455                    
Cash dividend | $     $ 245,800,000     $ 245,800,000 $ 245,500,000 $ 243,700,000 $ 242,600,000        
Dividends declared per common share (in dollars per share) | $ / shares           $ 0.455   $ 0.454   $ 0.910 $ 0.906    
Forecast                          
Class of Stock [Line Items]                          
Cash dividend | $       $ 246,100,000                  
Subsequent event                          
Class of Stock [Line Items]                          
Preferred dividends declared (in dollars per share) | $ / shares $ 18.750                        
Dividends declared per common share (in dollars per share) | $ / shares $ 0.455                        
Common Stock Held in Treasury                          
Class of Stock [Line Items]                          
Repurchased shares under authorization (in shares) | shares               200,000 800,000        
Common stock held in treasury (in shares) | shares         39,300,000 38,000,000.0 38,700,000 40,800,000 41,300,000 38,000,000.0 40,800,000 41,100,000  
Minimum                          
Class of Stock [Line Items]                          
Preferred stock, conversion ratio           16.0060       16.0060      
Maximum                          
Class of Stock [Line Items]                          
Preferred stock, conversion ratio           19.6080       19.6080      
Depository shares                          
Class of Stock [Line Items]                          
Issuance of Series A Preferred Stock (shares) | shares         29,700,000                
Convertible preferred stock                          
Class of Stock [Line Items]                          
Issuance of Series A Preferred Stock (shares) | shares         1,500,000                
Capped options indexed to equity, costs | $         $ 55,100,000                
Convertible preferred stock | Maximum                          
Class of Stock [Line Items]                          
Option indexed to equity, strike price (in dollars per share) | $ / shares         $ 71.40