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Description of Business and Summary of Significant Accounting Policies Newly Adopted Accounting Pronouncements (Details) $ in Millions	12 Months Ended
	Dec. 27, 2014 USD ($)
Other Current Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change resulting from newly adopted accounting pronouncements	$ 27.6
Other Current Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change resulting from newly adopted accounting pronouncements	1.5
Noncurrent Deferred Tax Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change resulting from newly adopted accounting pronouncements	7.7
Noncurrent Deferred Tax Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change resulting from newly adopted accounting pronouncements	18.4
Deferred Debt Issuance Costs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change resulting from newly adopted accounting pronouncements	$ 5.4