Annual report pursuant to Section 13 and 15(d)

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

v3.20.2
Summary of Significant Accounting Policies - Trade receivables, Inventories and Property, plant, and equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Trade Receivables      
Reserve for trade receivables $ 24.0 $ 22.5  
Inventories      
Percentage of inventories determined by LIFO method 11.00% 28.00%  
Difference in valuation if the FIFO method of inventory accounting had been used for all inventories $ 14.9 $ 17.3  
Raw materials and components 133.3 68.2  
Work in process 88.7 40.5  
Finished goods 163.4 49.0  
Total inventories 385.4 157.7  
Properties      
Depreciation expense 55.7 23.2 $ 23.4
Cost 656.3 429.2  
Accumulated Depreciation $ (342.1) (299.8)  
Minimum      
Properties      
Finite-Lived Intangible Asset, Useful Life 3 years    
Maximum      
Properties      
Finite-Lived Intangible Asset, Useful Life 21 years    
Land and land improvements      
Properties      
Cost $ 27.8 13.1  
Accumulated Depreciation (3.6) (3.4)  
Buildings and building equipment      
Properties      
Cost 159.4 95.7  
Accumulated Depreciation $ (70.1) (61.3)  
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 $ 469.1 320.4  
Accumulated Depreciation $ (268.4) $ (235.1)  
Machinery and equipment | Minimum      
Properties      
Estimated useful lives 3 years    
Machinery and equipment | Maximum      
Properties      
Estimated useful lives 25 years