Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended	12 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 30, 2013 State and Local Jurisdiction [Member]	Dec. 31, 2012 State and Local Jurisdiction [Member]	Mar. 30, 2013 Statute of Limitations Expected to Expire [Member] State and Local Jurisdiction [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
(Benefit) provision for income taxes	$ (4.9)	$ 1.6		$ 1.6
Effective tax rate	24.50%
Income tax at the federal statutory rate	35.00%	35.00%
Liability for Uncertain Tax Positions, Noncurrent	24.5		26.4
Unrecognized Tax Benefits	33.0		34.5		2.3
Unrecognized tax benefits that would impact effective tax rate	13.8		14.6
Amount of unrecorded benefit						2.2
Unrecognized Tax Benefits, Interest on Income Taxes Expense					0.8
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities				0.7
Interest on income taxes accrued	$ 2.3		$ 2.8