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Restructuring and Acquisition-Related Costs Restructuring Reserve Table (Details) - USD ($)
$ in Millions
12 Months Ended 15 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Restructuring Reserve [Roll Forward]      
Restructuring reserve $ 9.8 $ 0.0  
Restructuring charges 17.4 15.3  
Cash utilization (25.4) (1.0)  
Non-cash utilization (1.5) (4.5)  
Restructuring reserve 0.3 9.8 $ 0.3
Employee Severance [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring reserve 0.6 0.0  
Restructuring charges 2.0 0.6 2.6
Cash utilization (2.3) 0.0  
Non-cash utilization 0.0 0.0  
Restructuring reserve 0.3 0.6 0.3
Other Restructuring [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring reserve 9.2 0.0  
Restructuring charges 13.9 10.2 24.1
Cash utilization (23.1) (1.0)  
Non-cash utilization 0.0 0.0  
Restructuring reserve 0.0 9.2 0.0
Facility Closing [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring reserve 0.0 0.0  
Restructuring charges 1.5 4.5 6.0
Cash utilization 0.0 0.0  
Non-cash utilization (1.5) (4.5)  
Restructuring reserve $ 0.0 $ 0.0 $ 0.0