Schedule of Other Expense Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012	Sep. 25, 2011
Components of Other Income (Expense) [Line Items]
Interest expense	$ 1.7	$ 1.9	$ 5.7	$ 5.3
Interest income	(0.6)	(0.7)	(1.8)	(2.0)
Other (income) expense, net	0.1	0.2	0.3	2.5
Other expense, net	$ 1.2	$ 1.4	$ 4.2	$ 5.8