Pension Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Dec. 29, 2012
Pension and Other Postretirement Benefit Expense [Abstract]
Defined benefit pension plans net actuarial loss amortized into periodic pension	$ 4.0
Defined benefit pension plans prior service cost amortized into periodic pension benefit cost	0.2
Contribution to defined benefit pension plans	0.5	1.8	11.7
Expected additional contribution to defined benefit pension plans	$ 3.1