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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]          
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax $ (27.3)   $ (27.3)   $ (28.5)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax     1.2    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (11.3)   (11.3)   (20.2)
Foreign currency translation (4.4) $ (2.1) 8.9 $ 1.9  
Accumulated other comprehensive income (loss) (38.6)   (38.6)   $ (48.7)
Other comprehensive income (loss), net of tax     10.1    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax     8.9    
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax     0.0    
Minimum pension liability     1.6    
Other comprehensive income (loss), pension income tax effects $ (0.2) $ (0.3) $ (0.4) $ (0.6)