Components of Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 01, 2011	Jun. 30, 2012	Jul. 01, 2011
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.2	$ 0.2	$ 0.5	$ 0.5
Interest cost	1.1	1.1	2.1	2.2
Expected return on plan assets	(1.0)	(1.0)	(1.9)	(2.0)
Amortization of prior service cost	0.2	0.1	0.3	0.2
Net periodic benefit cost	0.5	0.4	1.0	0.9
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.1	0.2	0.2
Interest cost	0.3	0.3	0.6	0.6
Amortization of prior service cost	0	0	0.1	0.1
Net periodic benefit cost	$ 0.4	$ 0.4	$ 0.9	$ 0.9