Receivables - Aging of Finance and Contract Receivables (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 30, 2017
Receivables [Abstract]
Finance receivables, 30-59 Days Past Due	$ 13.2	$ 19.3
Finance receivables, 60-90 Days Past Due	10.0	13.9
Finance receivables, Greater Than 90 Days Past Due	20.1	20.1
Finance receivables, Total Past Due	43.3	53.3
Finance receivables, Total Not Past Due	1,563.1	1,547.8
Finance receivables, Total	1,606.4	1,601.1
Finance receivables, Greater Than 90 Days Past Due and Accruing	15.8	15.4
Contract receivables, 30-59 Days Past Due	1.6	1.2
Contract receivables, 60-90 Days Past Due	0.9	0.6
Contract receivables, Greater Than 90 Days Past Due	2.4	1.9
Contract receivables, Total Past Due	4.9	3.7
Contract receivables, Total Not Past Due	417.8	420.3
Contract receivables, Total	422.7	424.0
Contract receivables, Greater Than 90 Days Past Due and Accruing	$ 0.4	$ 0.6