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Shareholders' Equity - Common Stock Rollforward (Details) - shares
 6 Months Ended 9 Months Ended
Jun. 30, 2024
Sep. 30, 2023
Increase (Decrease) in Stockholders' Equity    
Common stock, shares issued, beginning balance (in shares) 103,584,699  
Common shares, held in treasury, beginning balance (in shares) 730,130  
Common shares, beginning balance (in shares) 102,854,569  
Common stock acquired - share repurchase (in shares) 4,900,000 5,400,000
Share-based compensation programs (in shares) 1,000,000.0 1,400,000
Treasury Stock retirement (in shares)   0
Common stock, shares issued, ending balance (in shares) 105,241,324  
Common shares, held in treasury, ending balance (in shares) 6,188,053  
Common shares, ending balance (in shares) 99,053,271  
Common Stock    
Increase (Decrease) in Stockholders' Equity    
Common stock, shares issued, beginning balance (in shares) 103,600,000 97,800,000
Common shares, beginning balance (in shares) 102,900,000 97,200,000
Common shares issued (in shares) 0 9,700,000
Common stock acquired - share repurchase (in shares) 0 0
Share-based compensation programs (in shares) 1,600,000 2,100,000
Treasury Stock retirement (in shares)   (6,000,000.0)
Common stock, shares issued, ending balance (in shares) 105,200,000  
Treasury Stock    
Increase (Decrease) in Stockholders' Equity    
Common shares, held in treasury, beginning balance (in shares) (700,000) (600,000)
Common shares issued (in shares) 0 0
Common stock acquired - share repurchase (in shares) 4,900,000 5,400,000
Share-based compensation programs (in shares) 600,000 700,000
Treasury Stock retirement (in shares)   (6,000,000.0)
Common shares, held in treasury, ending balance (in shares) 6,200,000