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Statement of Other Comprehensive Income (Statement) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax $ (20.2) $ (8.3)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (28.5) (36.3)
Accumulated Other Comprehensive Income (Loss), Net of Tax (48.7) (44.6)
OCI, before Reclassifications, Net of Tax, Attributable to Parent (4.1)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax 7.8  
Other Comprehensive Income (Loss), Net of Tax (4.1) (39.6)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (11.9) $ (25.5)
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 Translation Adjustment, Tax $ 0.0