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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]      
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax $ (47.0)    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (3.3)    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax (1.5)    
Accumulated Other Comprehensive Income (Loss), Net of Tax (50.2)   $ (51.8)
Minimum pension liability, net of tax 0.5    
Foreign currency translation 0.1 $ (1.5)  
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 1.0    
Other Comprehensive Income (Loss), Net of Tax 1.6    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (46.5)    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (3.2)    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax (0.5)    
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (50.2)