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, 2018
Sep. 30, 2017
Sep. 30, 2016
Trade Receivables      
Reserve for trade receivables $ (22.2) $ (21.6)  
Inventories      
Percentage of inventories determined by LIFO method 30.00% 32.00%  
Difference in valuation if the FIFO method of inventory accounting had been used for all inventories $ 15.7 $ 15.0  
Raw materials and components 68.3 52.6  
Work in process 44.7 55.4  
Finished goods 59.5 43.6  
Total inventories 172.5 151.6  
Properties      
Depreciation expense 23.4 25.4 $ 25.6
Cost 445.8 462.2  
Accumulated Depreciation (303.8) (311.8)  
Land and land improvements      
Properties      
Cost 15.0 15.9  
Accumulated Depreciation (3.3) (3.5)  
Buildings and building equipment      
Properties      
Cost 102.3 110.5  
Accumulated Depreciation $ (60.7) (68.0)  
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 $ 328.5 335.8  
Accumulated Depreciation $ (239.8) $ (240.3)  
Machinery and equipment | Minimum      
Properties      
Estimated useful lives 3 years    
Machinery and equipment | Maximum      
Properties      
Estimated useful lives 25 years