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Shareholders' Equity - Changes in Class of Shares (Details) - shares
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance, common stock held in treasury (in shares) 41,142,968    
Beginning balance, preferred stock shares issued (in shares) 0    
Repurchase of common stock (shares) 1,000,000.0 11,900,000 12,900,000
Ending balance, common stock held in treasury (in shares) 39,292,311 41,142,968  
Ending balance, preferred stock shares issued (in shares) 1,485,000 0  
Series A Preferred Stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance, preferred stock shares issued (in shares) 0    
Issuance of Series A Preferred Stock (shares) 1,500,000    
Ending balance, preferred stock shares issued (in shares) 1,500,000 0  
Common Stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance, common stock shares issued (in shares) 577,800,000 577,800,000 577,800,000
Common stock issued under employee equity incentive plans (shares) 3,600,000 4,000,000.0 4,900,000
Common stock withheld for tax withholdings on employee equity awards (shares) (800,000) (900,000) (1,000,000.0)
Treasury stock used for new issuances (shares) (2,800,000) (3,100,000) (3,900,000)
Shares issued to settle convertible debt (shares) 200,000    
Ending balance, common stock shares issued (in shares) 578,000,000.0 577,800,000 577,800,000
Treasury Stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance, common stock held in treasury (in shares) 41,100,000 32,300,000 23,300,000
Repurchase of common stock (shares) 1,000,000.0 11,900,000 12,900,000
Treasury stock used for new issuances (shares) (2,800,000) (3,100,000) (3,900,000)
Ending balance, common stock held in treasury (in shares) 39,300,000 41,100,000 32,300,000