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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent $ 0.2    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (6.3)    
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax (59.4)    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax (1.6)    
Accumulated Other Comprehensive Income (Loss), Net of Tax (67.3)    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (6.1) $ (6.3)  
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax (57.7) (59.4)  
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax (4.5) (1.6)  
Accumulated Other Comprehensive Income (Loss), Net of Tax (68.3) (67.3)  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 10.6    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax (2.9)    
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, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax 12.3    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 0.0    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax 1.8 1.0 $ 0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0.2 (8.7) (4.4)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax 1.7    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (2.9)    
Other Comprehensive Income (Loss), Net of Tax $ (1.0) $ (6.6) $ (32.1)