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Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Entity
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Line Items]      
Operating segments 3    
Liquid investments maturity period 90 days    
Goodwill $ 144.6 $ 139.4  
Impairment charges 0 0 0
Trade Receivables
     
Significant Accounting Policies [Line Items]      
Trade and other receivables, net 847.6 768.0  
Other Receivables
     
Significant Accounting Policies [Line Items]      
Trade and other receivables, net 172.0 134.1  
Minimum
     
Significant Accounting Policies [Line Items]      
Warranty period 1 year    
Maximum
     
Significant Accounting Policies [Line Items]      
Warranty period 5 years    
Property Subject to Operating Lease | Minimum
     
Significant Accounting Policies [Line Items]      
Lease and guarantee periods(in years) 3    
Estimated useful life of equipment (in years) 4 years    
Property Subject to Operating Lease | Maximum
     
Significant Accounting Policies [Line Items]      
Lease and guarantee periods(in years) 5    
Estimated useful life of equipment (in years) 9 years    
Financial Services
     
Significant Accounting Policies [Line Items]      
Lease rental revenue 712.1 645.1 606.2
Depreciation and other expense 571.7 517.4 476.2
Modifications extended contractual terms 6 months 7 months  
Financial Services | Minimum | Loans Receivable
     
Significant Accounting Policies [Line Items]      
Receivable, collection period 36 months    
Financial Services | Maximum | Loans Receivable
     
Significant Accounting Policies [Line Items]      
Receivable, collection period 60 months    
Financial Services | Finance Leases Financing Receivable | Minimum
     
Significant Accounting Policies [Line Items]      
Origination cost, amortization period 36 months    
Financial Services | Finance Leases Financing Receivable | Maximum
     
Significant Accounting Policies [Line Items]      
Origination cost, amortization period 60 months    
Financial Services | Operating Lease
     
Significant Accounting Policies [Line Items]      
Lease rental revenue 631.7 551.5 527.8
Depreciation and other expense 503.5 434.9 412.5
Truck, Parts and Other
     
Significant Accounting Policies [Line Items]      
Trade and other receivables, net 1,019.6 902.1  
Trade receivable days outstanding considered past due 30 days 30 days 30 days
Allowance for credit losses 2.4 3.2  
Net charge-offs $ 0.2 $ 0.3 $ 1.1