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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Contributions by Employer   $ 1.2    
Percentage of Obligations Related to U.S. Plan   98.00%    
Defined Benefit Plan, Target Plan Asset Allocations   100.00%    
Defined Contribution Plan, Cost Recognized   $ 6.2 $ 5.6 $ 5.1
Percentage of Assets Related to U.S. Plan   98.00%    
Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Expected Return on Plan Assets Major Asset Classes Time Horizon   10    
Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Expected Return on Plan Assets Major Asset Classes Time Horizon   15    
Pension Plan, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Contributions by Employer     0.1  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments   $ (0.5) $ (0.2) $ (0.1)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   4.84% 4.49% 5.16%
Discount rate   4.49% 5.16% 4.21%
Equity Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Target Plan Asset Allocations   40.00%    
Fixed Income Funds [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Target Plan Asset Allocations     60.00%  
Scenario, Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension Contributions $ 0.8