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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent $ 6.3    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (6.3)    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (26.5)    
Accumulated Other Comprehensive Income (Loss), Net of Tax (32.8)    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 0.0 $ (6.3)  
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (36.0) (26.5)  
Accumulated Other Comprehensive Income (Loss), Net of Tax (36.0) (32.8)  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 11.9    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (5.6)    
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), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax 2.4    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax 2.4    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax 0.0 (0.9) $ (1.9)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 6.3 (3.0) 2.8
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax (9.5)    
Other Comprehensive Income (Loss), Net of Tax $ (3.2) $ 19.0 $ 16.5