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Statement of Other Comprehensive Income (Statement) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax $ 17.2 $ 8.0
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (22.2) (32.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax (5.0) (24.7)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax 9.2  
OCI, before Reclassifications, Net of Tax, Attributable to Parent 17.8  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax 8.6  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1.9  
Other Comprehensive Income (Loss), Defined Benefit Plan, Reclassifications 1.9  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax 0.0  
Other Comprehensive Income (Loss), Net of Tax 19.7 11.3
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification 10.5  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax $ 9.2 $ 8.0