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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements     $ 16.6 $ (0.5) $ 0.0
Defined Benefit Plan, Other Information 0.75        
Defined Benefit Plan, Settlements, Plan Assets     58.5    
Defined Benefit Plan, Contributions by Employer     $ 0.0 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     $ 5.9 6.2 5.6
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, Settlements, Plan Assets     $ 58.5 1.9  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments     $ (16.6) $ (0.5) $ (0.2)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     3.68% 4.84% 4.49%
Discount rate     3.92% 4.49% 5.16%
Equity Securities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Target Plan Asset Allocations     30.00% 40.00%  
Scenario, Forecast [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension Contributions   $ 1.3