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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, 2021
Mar. 31, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax   $ (32.7)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax   8.0
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (19.7) (19.7)
Minimum pension liability, net of tax   1.0
Foreign currency translation (0.5) 4.0
Other Comprehensive Income (Loss), Net of Tax   5.0
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax 31.7 31.7
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 12.0 12.0
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (19.7) $ (19.7)