Recorded Investment for Finance Receivables that are on Non-accrual Status (Detail) - Financial Services - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment of finance receivables that are on non-accrual status	$ 56.5	$ 65.7
Dealer | Wholesale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment of finance receivables that are on non-accrual status	0.1	5.0
Customer Retail | Fleet
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment of finance receivables that are on non-accrual status	49.5	50.7
Customer Retail | Owner/Operator
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment of finance receivables that are on non-accrual status	$ 6.9	$ 10.0