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Restructuring and Acquisition-Related Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Restructuring Reserve [Roll Forward]    
Restructuring Reserve $ 9.8  
Restructuring Charges 6.8  
Payments for Restructuring (2.6)  
Restructuring Reserve, Settled without Cash 0.0  
Restructuring Reserve, Accrual Adjustment 0.0  
Restructuring Reserve 14.0 $ 14.0
Other Restructuring [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 9.2  
Restructuring Charges 5.6 15.8
Payments for Restructuring (1.5)  
Restructuring Reserve, Settled without Cash 0.0  
Restructuring Reserve, Accrual Adjustment 0.0  
Restructuring Reserve 13.3 13.3
Employee Severance [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 0.6  
Restructuring Charges 1.2 1.8
Payments for Restructuring (1.1)  
Restructuring Reserve, Settled without Cash 0.0  
Restructuring Reserve, Accrual Adjustment 0.0  
Restructuring Reserve $ 0.7 $ 0.7