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Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, net $ 3,398.1 $ 3,270.4 $ 2,883.8
Truck, Parts and Other      
Property, Plant and Equipment [Line Items]      
Land 277.6 286.4  
Buildings and improvements 1,596.8 1,474.7  
Machinery, equipment and production tooling 5,076.0 4,234.4  
Construction in progress 313.9 1,081.8  
Property, Plant and Equipment, Gross, Total 7,264.3 7,077.3  
Less allowance for depreciation (3,866.2) (3,806.9)  
Property, plant and equipment, net $ 3,398.1 $ 3,270.4  
Truck, Parts and Other | Minimum | Building and Building Improvements      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
Truck, Parts and Other | Minimum | Machinery Equipment And Production Tooling      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Truck, Parts and Other | Maximum | Building and Building Improvements      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 40 years    
Truck, Parts and Other | Maximum | Machinery Equipment And Production Tooling      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 20 years