Business Acquisitions (Details) (USD $) In Millions, unless otherwise specified	Dec. 20, 2012 Lorex Technology Inc. Thermal Vision and Measurement	Dec. 28, 2012 Traficon International NV Thermal Vision and Measurement	Dec. 31, 2012 Lorex Technology, Inc and Traficon International NV [Member] Thermal Vision and Measurement	Jul. 31, 2011 Aerius Photonics, LLC Thermal Vision and Measurement	Dec. 31, 2011 Tacktick Ltd And Belamarin OY Raymarine
Business Acquisition [Line Items]
Business acquisition, purchase price	$ 61.2	$ 46.3		$ 27.0	$ 5.1
Business acquisition, purchase price allocation, intangible assets				8.8	1.1
Business acquisition, purchase price allocation, goodwill				16.5	1.5
Other assets			$ 84.1