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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Statement of Comprehensive Income [Abstract] |  |  |
Net change related to employee benefit plans, net of income taxes | $ 1.2 | $ 2.3 | $ 1.8

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