Share-Based Payments Stock Options (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Proceeds from Stock Plans	$ 20.8	$ 6.3
Options and Sosars [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at the beginning of the period (in shares)	7.1
Granted (in shares)	0.2
Exercised (in shares)	(0.7)
Forfeited (in shares)	(0.1)
Outstanding at the end of the period (in shares)	6.5
Exercisable (in shares)	5.6
Weighted-average exercise price of shares outstanding, beginning of the period (in dollars per share)	$ 38.69
Weighted-average exercise price of shares granted (in dollars per share)	$ 42.80
Weighted-average exercise price of shares exercised (in dollars per share)	$ 30.06
Weighted-average exercise price of shares forfeited (in dollars per share)	$ 46.86
Weighted-average exercise price of shares outstanding, end of the period (in dollars per share)	$ 39.70
Weighted-average exercise price of shares exercisable (in dollars per share)	$ 39.09
Weighted-average remaining contractual life, outstanding (in years)	4.31
Weighted-average remaining contractual life, outstanding (in years)	4.28
Weighted-average remaining contractual life, exercisable (in years)	3.63
Aggregate intrinsic value of shares outstanding (in dollars)	43.1
Aggregate intrinsic value of shares outstanding (in dollars)	26.0
Aggregate intrinsic value of shares exercisable (in dollars)	26.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	9.6	2.1
Proceeds from Stock Plans	20.8
Tax Benefit from Stock Options Exercised	$ 3.2