Taxes on Income Taxes on Income (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 23, 2013	Jun. 15, 2013	Jun. 16, 2012
Income Tax Disclosure [Abstract]
Income tax expense, percentage		18.50%	32.80%
Proceeds from company-owned life insurance policies	$ 68.7	$ 68.7	$ 0
Change in income tax expense due to reversal of deferred tax liability	17.2
Change in income tax expense due to resolution of federal tax matters	$ 5.0