Summary of Significant Accounting Policies Prospective Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions	Jun. 25, 2016	Dec. 26, 2015	Jun. 27, 2015
Item Effected [Line Items]
Deferred Finance Cost, Decrease in Other Assets	$ 7.1		$ 11.1
Deferred Finance Cost, Decrease in Other Current Assets	2.8		1.2
Debt Instrument, Decrease in Long Term Debt	$ 9.9		$ 12.3
Change in Defer Tax Assets, Current		$ 50.6
Increase Decrease in Other Assets, Non-Current		40.7
Increase Decrease to Deferred Tax Liabilities, Non-current		$ 9.9