Incentive Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		9 Months Ended	12 Months Ended			56 Months Ended			12 Months Ended
	Jan. 31, 2011	Feb. 28, 2010	Oct. 01, 2011	Dec. 31, 2011 months	Dec. 25, 2010	Dec. 26, 2009	Dec. 31, 2011	Dec. 31, 2011 Incentive Plan 2010 [Member]	May 12, 2010 Incentive Plan 2010 [Member]	Dec. 31, 2011 Cash Settled Awards [Member]	Dec. 25, 2010 Cash Settled Awards [Member]	Dec. 26, 2009 Cash Settled Awards [Member]	Dec. 31, 2011 Treasury Stock [Member]	Dec. 25, 2010 Treasury Stock [Member]	Dec. 26, 2009 Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant								4,684,081	4,750,000
Shares outstanding under cash settled awards										7,530	10,651	7,969
Fair value of cash settled awards										$ 0.4	$ 0.5
Compensation Expense [Abstract]
Compensation expense				18.0	14.8	13.2				18.7	23.6	25.1
Tax benefit from compensation expense				6.5	5.4	4.8
Unrecognized stock based compensation expense				22.8			22.8
Unrecognized stock based compensation expense, period of recognition (in months)				26
Repurchase of Stock [Abstract]
Stock repurchase program, authorized amount	600	350	1,200
Stock repurchase program, additional amount authorized	250		600
Stock repurchase program, intended shares outstanding		63,000,000
Repurchase of common stock, shares				7,100,000	1,300,000	1,800,000	12,200,000
Repurchase of common stock, value				$ 426.1	$ 60.3	$ 77.0	$ 627.7						$ 426.1	$ 60.3	$ 77.0