Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	0 Months Ended
	Dec. 31, 2008	Jul. 17, 2014 lawsuits	Oct. 08, 2014 lawsuits	Mar. 27, 2015 lawsuits	Dec. 31, 2014	Dec. 08, 2011	Jan. 23, 2012	Mar. 29, 2013
Commitments and Contingencies Disclosure [Abstract]
Significant Commitment, Remaining Minimum Amount Committed				$ 181.9
Non-cancelable license obligations				12.8	59.5
Loss Contingencies [Line Items]
Income Taxes Paid	18.0
Loss Contingency, Pending Claims, Number				2
Tax Return Examination Years 2002 through 2004 [Member]
Loss Contingencies [Line Items]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority						19.8
Tax Return Examination Years 2005 through 2007 [Member]
Loss Contingencies [Line Items]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority							21.4
Tax Return Examination Years 2004 through 2007 [Member]
Loss Contingencies [Line Items]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority								$ (6.8)
PLL Technologies, Inc. [Member]
Loss Contingencies [Line Items]
Loss Contingency, Claims Filed, Number		1
PACT XPP Technologies, AG [Member]
Loss Contingencies [Line Items]
Loss Contingency, Claims Filed, Number			1