Selected Quarterly Financial Data Selected Quarterly Financial Data - Additional Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended			3 Months Ended
	Dec. 31, 2014	Sep. 26, 2014	Jun. 27, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 27, 2013
Income Tax Contingency [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 0.3	$ 4.2	$ 24.5
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations				9.5	1.3	0.9
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member] | Tax Year 2008 through 2010 [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		$ 9.0					$ 39.0