Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 30, 2012
Accumulated depreciation and amortization	$ 333.8	$ 327.9
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	125,000,000	125,000,000
Common Stock, Shares, Issued	37,356,380	37,162,697
Common stock, shares outstanding	37,356,380	37,162,697