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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2022
Sep. 30, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]      
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax $ (21.5) $ (21.5) $ (22.2)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax   0.7  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 19.3 19.3 17.2
Foreign currency translation (3.6) 2.1  
Accumulated other comprehensive income (loss) $ (2.2) (2.2) $ (5.0)
Other comprehensive income (loss), net of tax   $ 2.8