Financial Instruments - Fair Values of Financial Instruments Not Approximating Carrying Values in Financial Statements (Detail) - USD ($) $ in Millions	Jul. 01, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, notes payable and current maturities of long-term debt	$ 1,105.8	$ 1,010.2
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables - net	1,495.1	1,407.0
Contract receivables - net	381.8	374.8
Long-term debt, notes payable and current maturities of long-term debt	1,105.8	1,010.2
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables - net	1,735.1	1,631.2
Contract receivables - net	419.3	409.7
Long-term debt, notes payable and current maturities of long-term debt	$ 1,116.5	$ 1,076.7