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Restructuring Activities - Schedule of Board Approved Restructuring (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Total Restructuring Program Range      
Total expense $ 61.7 $ 28.8 $ 40.9
Capital expenditures 1.0 $ 21.3 $ 123.5
Program      
Restructuring Costs Incurred To Date [Abstract]      
Costs of reduction in headcount as a result of reorganization (285.0)    
Other expenses associated with the Program (137.0)    
Total expense (422.0)    
Cumulative capital expenditures (236.0)    
Total cash cost (658.0)    
Program | Minimum      
Total Restructuring Program Range      
Costs of reduction in headcount as a result of reorganization 385.0    
Other expenses associated with the Program 205.0    
Total expense 590.0    
Capital expenditures 250.0    
Total estimated cash cost 840.0    
Restructuring and Related Cost, Expected Cost [Abstract]      
Costs of reduction in headcount as a result of reorganization 100.0    
Other expenses associated with the Program 68.0    
Total expense 168.0    
Capital expenditures 14.0    
Total estimated cash cost 182.0    
Program | Maximum      
Total Restructuring Program Range      
Costs of reduction in headcount as a result of reorganization 405.0    
Other expenses associated with the Program 225.0    
Total expense 630.0    
Capital expenditures 255.0    
Total estimated cash cost 885.0    
Restructuring and Related Cost, Expected Cost [Abstract]      
Costs of reduction in headcount as a result of reorganization 120.0    
Other expenses associated with the Program 88.0    
Total expense 208.0    
Capital expenditures 19.0    
Total estimated cash cost $ 227.0