Annual Minimum Payments Due on Finance Receivables (Detail) - Financial Services - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	$ 9,653.2	$ 8,797.7
Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
2018	1,351.5
2019	1,088.1
2020	857.2
2021	542.0
2022	242.9
Thereafter	66.1
Financing Receivables	4,147.8
Finance Leases Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
2018	1,226.7
2019	959.6
2020	716.6
2021	440.6
2022	217.8
Thereafter	90.6
Financing Receivables	$ 3,651.9