Receivables - Components of Current Finance and Contract Receivables (Detail) - USD ($) $ in Millions	Sep. 28, 2019	Dec. 29, 2018
Receivables [Abstract]
Finance receivables	$ 553.3	$ 538.1
Contract receivables	104.3	99.5
Total	657.6	637.6
Allowances for doubtful accounts:
Finance receivables	(19.8)	(19.6)
Contract receivables	(1.6)	(1.2)
Total	(21.4)	(20.8)
Total current finance and contract receivables – net	636.2	616.8
Finance receivables – net	533.5	518.5
Contract receivables – net	$ 102.7	$ 98.3