Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 29, 2013	Dec. 28, 2012
Accounts receivable, allowances	$ 1.3	$ 1.3
Preferred stock, authorized	5,000,000	5,000,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, authorized	1,000,000,000	1,000,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	510,921,560	508,846,484
Treasury stock, shares	153,395,726	141,284,352