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Equity Items - Schedule of Stock Repurchase Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Share Repurchase Program [Line Items] |  |  |  |
Common shares repurchased | 1,541,320 | 0 | 1,541,320 | 1,238,212
2023 Stock Repurchase Program |  |  |  |
Share Repurchase Program [Line Items] |  |  |  |
Common shares repurchased | 1,500,000 | 0 | 1,500,000 | 1,200,000
Weighted-average price per share | $ 64.9 | $ 0 | $ 64.9 | $ 80.78
Aggregate purchase price | $ 100 | $ 0 | $ 100 | $ 100

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