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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
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