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Restructuring Activities - Schedule of Approved Restructuring Spending (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Total Restructuring Program Range    
Other expenses associated with the Program $ 16.7 $ 2.2
Total charges 24.1 10.8
Capital expenditures 0.5 $ 0.2
Program    
Total Restructuring Program Range    
Other expenses associated with the Program 16.7  
Less Cumulative Spend to Date    
Costs of reduction in headcount as a result of reorganization (292.0)  
Other expenses associated with the Program (154.0)  
Total expense (446.0)  
Capital expenditures (237.0)  
Total estimated cash cost (683.0)  
Program | Minimum    
Total Restructuring Program Range    
Restructuring And Related Cost Of Reduction 385.0  
Other expenses associated with the Program 205.0  
Total charges 590.0  
Capital expenditures 250.0  
Total estimated net cash cost 840.0  
Restructuring and Related Cost, Expected Cost [Abstract]    
Costs of reduction in headcount as a result of reorganization 93.0  
Other expenses associated with the Program 51.0  
Total expense 144.0  
Capital expenditures 13.0  
Total estimated cash cost 157.0  
Program | Maximum    
Total Restructuring Program Range    
Restructuring And Related Cost Of Reduction 405.0  
Other expenses associated with the Program 225.0  
Total charges 630.0  
Capital expenditures 255.0  
Total estimated net cash cost 885.0  
Restructuring and Related Cost, Expected Cost [Abstract]    
Costs of reduction in headcount as a result of reorganization 113.0  
Other expenses associated with the Program 71.0  
Total expense 184.0  
Capital expenditures 18.0  
Total estimated cash cost $ 202.0