Receivables - Components of Current Finance and Contract Receivables (Detail) - USD ($) $ in Millions	Jun. 29, 2019	Dec. 29, 2018
Receivables [Abstract]
Finance receivables	$ 548.5	$ 538.1
Contract receivables	92.8	99.5
Total	641.3	637.6
Allowances for doubtful accounts:
Finance receivables	(19.5)	(19.6)
Contract receivables	(1.3)	(1.2)
Total	(20.8)	(20.8)
Total current finance and contract receivables – net	620.5	616.8
Finance receivables – net	529.0	518.5
Contract receivables – net	$ 91.5	$ 98.3