Employee Benefit Plans (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Components of net periodic benefit cost
Service cost-benefits earned	$ 1.3	$ 1.1	$ 2.6	$ 2.2
Interest costs on benefits obligation	1.5	1.4	3.0	2.8
Expected return on assets	(1.8)	(1.5)	(3.6)	(3.0)
Prior service costs and net actuarial loss amortization	0.8	0.7	1.6	1.3
Net periodic benefit cost	1.8	1.7	3.6	3.3
Defined benefit plan employer contributions
Employer contributions			5.1	5.1
Expected employer contributions for remainder of current year	$ 5.1		$ 5.1