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Shareowners' Equity - Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Equity [Abstract] |  |  |
Common stock, authorized (in shares) | 1,000,000,000 |  |
Common stock, par value (in dollars per share) | $ 1.00 | $ 1.00 |
Preferred stock, authorized (in shares) | 25,000,000 |  |
Common stock reserved for various incentive plans (in shares) | 12,200,000 |  |
Outstanding purchase of common stock recorded in accounts payable | $ 0.4 | $ 1.1 |
Changes in outstanding common shares |  |  |
Beginning balance (in shares) | 114,800,000 | 115,200,000 | 116,000,000.0
Treasury stock purchases (in shares) | (2,200,000) | (1,200,000) | (1,300,000)
Common stock issued (including share based compensation impact) (in shares) | 500,000 | 800,000 | 500,000
Ending balance (in shares) | 113,100,000 | 114,800,000 | 115,200,000

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