Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Trade receivables, Inventories and Property, plant, and equipment (Details)

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Summary of Significant Accounting Policies - Trade receivables, Inventories and Property, plant, and equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Trade Receivables      
Reserve for trade receivables $ (21.6) $ (21.0)  
Inventories      
Percentage of inventories determined by LIFO method 32.00% 32.00%  
Difference in valuation if the FIFO method of inventory accounting had been used for all inventories $ 15.0 $ 15.2  
Raw materials and components 52.6 51.4  
Work in process 55.4 54.0  
Finished goods 43.6 47.7  
Total inventories 151.6 153.1  
Properties      
Depreciation expense 25.4 25.6 $ 26.2
Cost 462.2 451.9  
Accumulated Depreciation (311.8) (299.4)  
Land and land improvements      
Properties      
Cost 15.9 17.3  
Accumulated Depreciation (3.5) (3.6)  
Buildings and building equipment      
Properties      
Cost 110.5 105.6  
Accumulated Depreciation $ (68.0) (64.3)  
Buildings and building equipment | Minimum      
Properties      
Estimated useful lives 3 years    
Buildings and building equipment | Maximum      
Properties      
Estimated useful lives 50 years    
Machinery and equipment      
Properties      
Cost $ 335.8 329.0  
Accumulated Depreciation $ (240.3) $ (231.5)  
Machinery and equipment | Minimum      
Properties      
Estimated useful lives 3 years    
Machinery and equipment | Maximum      
Properties      
Estimated useful lives 25 years