Subsequent Event Subsequent Event (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended	0 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014 Test & Measurement	Sep. 27, 2013 Test & Measurement	Sep. 26, 2014 Test & Measurement	Sep. 27, 2013 Test & Measurement	Dec. 31, 2013 Test & Measurement Communications business	Oct. 13, 2014 Test & Measurement Communications business Subsequent Event	Oct. 13, 2014 Test & Measurement Communications business Subsequent Event
Sales	$ 4,870.3	$ 4,669.1	$ 14,496.6	$ 13,851.3	$ 821.0	$ 808.6	$ 2,548.5	$ 2,519.0	$ 836.0
Business combination, merger agreement, aggregate consideration, number of shares										62.5
Business combination, merger agreement, percentage of investment ownership											60.00%