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Acquisitions Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition [Line Items]        
Restructuring and Related Cost, Cost Incurred to Date $ 38.0   $ 38.0  
Restructuring and Related Cost, Expected Cost Remaining 28.2   28.2  
Restructuring and Related Cost, Incurred Cost 21.2 $ 5.4 32.7 $ 8.2
Other Restructuring [Member]        
Business Acquisition [Line Items]        
Restructuring and Related Cost, Cost Incurred to Date 30.0   30.0  
Restructuring and Related Cost, Expected Cost Remaining 20.3   20.3  
Restructuring and Related Cost, Incurred Cost 16.8 4.1 25.0 5.2
Special Termination Benefits [Member]        
Business Acquisition [Line Items]        
Restructuring and Related Cost, Cost Incurred to Date 8.0   8.0  
Restructuring and Related Cost, Expected Cost Remaining 7.9   7.9  
Restructuring and Related Cost, Incurred Cost $ 4.4 $ 1.3 $ 7.7 $ 3.0