Receivables - Components of Current Finance and Contract Receivables (Detail) - USD ($) $ in Millions	Jul. 01, 2017	Dec. 31, 2016
Receivables [Abstract]
Finance receivables, net of unearned finance charges of $19.3 million and $17.0 million, respectively	$ 513.0	$ 488.1
Contract receivables, net of unearned finance charges of $16.5 million and $15.6 million, respectively	83.8	89.3
Total	596.8	577.4
Allowances for doubtful accounts, finance receivables	(16.5)	(15.6)
Allowances for doubtful accounts, contract receivables	(1.4)	(1.2)
Total	(17.9)	(16.8)
Total current finance and contract receivables - net	578.9	560.6
Finance receivables - net	496.5	472.5
Contract receivables - net	82.4	88.1
Total current finance and contract receivables - net	$ 578.9	$ 560.6