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Special Charges (Schedule of Restructuring Activity) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 11.3  
Expenses     21.8  
Cash payments     (22.0)  
Restructuring Reserve, Accrual Adjustment     (0.1)  
Ending Balance $ 11.0   11.0  
Special charges 5.9 $ 9.5 40.1 $ 26.1
Global Restructuring Program [Member]        
Restructuring Cost and Reserve [Line Items]        
Special charges 3.0 6.7    
Business Optimization [Member]        
Restructuring Cost and Reserve [Line Items]        
Special charges     8.1 15.3
Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Special charges 2.1 2.4 7.6 9.2
Employee Severance [Member]        
Restructuring Cost and Reserve [Line Items]        
Special charges $ 0.4 $ 0.0    
Employee Severance [Member] | Business Optimization [Member]        
Restructuring Cost and Reserve [Line Items]        
Special charges     $ 24.0 $ 0.0