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Restructuring and Acquisition-Related Costs (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Restructuring Reserve [Roll Forward]    
Restructuring Reserve $ 9.8  
Charges 15.2  
Cash utilization (20.1)  
Non-cash utilization 0.0  
Accrual adjustments 0.0  
Restructuring Reserve 4.9 $ 4.9
Other Restructuring [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 9.2  
Charges 13.5 23.7
Cash utilization (17.8)  
Non-cash utilization 0.0  
Accrual adjustments 0.0  
Restructuring Reserve 4.9 4.9
Employee Severance [Member]    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve 0.6  
Charges 1.7 2.3
Cash utilization (2.3)  
Non-cash utilization 0.0  
Accrual adjustments 0.0  
Restructuring Reserve $ 0.0 $ 0.0