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Special Charges (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]          
Special charges $ 8.8   $ 3.5 $ 16.6 $ 11.5
Professional Fees   $ 4.0      
Restructuring charges       4.4  
Site Consolidation [Member] | Facility Closing [Member]          
Restructuring Cost and Reserve [Line Items]          
Special charges 0.7   1.0 1.2 5.1
Business Optimization [Member]          
Restructuring Cost and Reserve [Line Items]          
Special charges 8.2   2.5 15.5 6.3
Business Optimization [Member] | Employee Severance [Member]          
Restructuring Cost and Reserve [Line Items]          
Special charges 2.1   $ 1.0 3.9 $ 3.8
Global Restructuring Program [Member] | Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Special charges 4.5     8.6  
Restructuring charges 9.9     19.3  
Property, Plant and Equipment [Member] | Global Restructuring Program [Member] | Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges $ 5.4     $ 10.7