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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss, net $ (24.5) $ (24.6)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (1.4) (7.4) $ (4.0)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax (1.2) 0.2 1.5
Net unrealized gain on available-for-sale securities 0.0 0.0 2.7
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax 0.4 0.5 0.3
Other Comprehensive Income (Loss), Net of Tax 0.1 (7.1) (5.9)
Accumulated Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss, net (21.5) (20.1)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (1.4)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax 0.0    
Other Comprehensive Income (Loss), Net of Tax (1.4)    
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss, net (3.0) (4.5)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 1.2    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax 0.3    
Other Comprehensive Income (Loss), Net of Tax 1.5    
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss, net (24.5) (24.6)  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (0.2)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.3    
Other Comprehensive Income (Loss), Net of Tax $ 0.1 $ (7.1) $ (5.9)