Description of Business and Summary of Significant Accounting Policies Pension and Other Post-Retirement Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 26, 2015	Dec. 27, 2014
Change in Discount Rate Methodology
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase (decrease) in pension and postretirement obligations		$ 5.5
US Pension Plan \| Change in Mortality Tables
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase (decrease) in pension and postretirement obligations	$ 3.3	$ 7.9

The increase (decrease) during the reporting period in the amount due to fund pension and non-pension benefits to employees, retired and disabled former employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Name:	us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration