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Property, net (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Property, net      
Land $ 4.5 $ 3.7  
Buildings and improvements 319.0 315.9  
Machinery and equipment 1,042.3 1,032.4  
Internal-use software 441.3 418.2  
Construction in progress 97.6 118.2  
Total 1,904.7 1,888.4  
Less accumulated depreciation (1,299.1) (1,255.5)  
Property, net $ 605.6 $ 632.9 $ 616.0