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Share-Based Compensation - Schedule of stock-based compensation costs (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Compensation Related Costs [Abstract] |  |
Share-based compensation costs | $ 4.7 | $ 4.7
Less impact of income taxes | 1.1 | 1.1
Share-based compensation costs, net of tax | $ 3.6 | $ 3.6

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