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Acquisitions Schedule of Restructuring Accrual Rollforward (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Schedule Of Restructuring Accrual Rollforward [Line Items]      
Restructuring Reserve $ 10.0   $ 2.6
Increase (Decrease) in Restructuring Reserve 9.8    
Payments for Restructuring 2.4    
Non Cash Restructuring And Related Charges   $ (3.3)  
Special Termination Benefits [Member]      
Schedule Of Restructuring Accrual Rollforward [Line Items]      
Restructuring Reserve 5.3   1.6
Increase (Decrease) in Restructuring Reserve 5.7    
Payments for Restructuring 2.0    
Other Restructuring [Member]      
Schedule Of Restructuring Accrual Rollforward [Line Items]      
Restructuring Reserve 4.7   $ 1.0
Increase (Decrease) in Restructuring Reserve 4.1    
Payments for Restructuring $ 0.4