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Consolidated Statement of Comprehensive Income Statement - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Net Income (Loss) Attributable to Parent $ 85.5 $ 76.6 $ 70.4
Other comprehensive income (loss):      
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax (10.4)    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax (2.6)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (11.9) (25.5) 9.2
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (4.1) (39.6) 19.7
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 81.4 37.0 90.1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax $ 7.8 $ (14.1) $ 10.5