Business Combinations and Investments, Goodwill and Acquired Intangible Assets (Details Textual) In Millions, unless otherwise specified	3 Months Ended			0 Months Ended	12 Months Ended		0 Months Ended	3 Months Ended
	Mar. 31, 2013 USD ($)	Apr. 01, 2012 USD ($)	Dec. 30, 2012 USD ($)	Mar. 01, 2013 RESON A/S [Member] USD ($)	Dec. 30, 2012 RESON A/S [Member] EUR (€)	Mar. 31, 2013 RESON A/S [Member] USD ($)	Feb. 25, 2012 VariSystems Inc [Member] USD ($)	Jul. 01, 2012 VariSystems Inc [Member] USD ($)
Business Acquisition [Line Items]
Goodwill	$ 1,014.8		$ 990.2			$ 35.1
Purchase of businesses and other investments	69.7	34.9
Payments to acquire businesses, net of cash acquired				69.7			34.9
Sales reported by acquired entity for last annual period					50.8
Purchase price adjustment								1.4
Net acquired intangible assets	$ 280.1		$ 265.7