TDRs Modified that Subsequently Defaulted (i.e., Became More than 30 Days Past-Due) by Portfolio Class (Detail) - Financial Services - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Modifications [Line Items]
Subsequently Defaulted, Amortized Cost Basis	$ 0.1	$ 0.7
Customer Retail | Fleet
Financing Receivable, Modifications [Line Items]
Subsequently Defaulted, Amortized Cost Basis		0.6
Customer Retail | Owner/Operator
Financing Receivable, Modifications [Line Items]
Subsequently Defaulted, Amortized Cost Basis	$ 0.1	$ 0.1