Segment Information (Reconciliation) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Net sales(a):
Net sales	[1]	$ 555.4	$ 601.1	$ 1,698.1	$ 1,771.7
Net sales, percentage change	[1]	(7.60%)		(4.20%)
Operating income:
Total segment operating profit		$ 69.5	74.3	$ 205.7	214.6
Total segment operating profit, percentage change		(6.50%)		(4.10%)
Intersegment Eliminations
Operating income:
Revenues		$ 4.8	4.9	$ 14.7	14.8
Corporate, Non-Segment
Operating income:
Total segment operating profit		$ 8.9	10.6	$ 30.1	32.6
Total segment operating profit, percentage change		(16.00%)		(7.70%)
Instrumentation
Net sales(a):
Net sales	[1]	$ 243.2	280.4	$ 784.8	815.9
Net sales, percentage change	[1]	(13.30%)		(3.80%)
Instrumentation | Operating Segments
Operating income:
Total segment operating profit		$ 38.6	46.9	$ 126.4	128.2
Total segment operating profit, percentage change		(17.70%)		(1.40%)
Digital Imaging
Net sales(a):
Net sales	[1]	$ 95.7	95.6	$ 276.9	301.2
Net sales, percentage change	[1]	0.10%		(8.10%)
Digital Imaging | Operating Segments
Operating income:
Total segment operating profit		$ 10.4	7.9	$ 28.5	29.3
Total segment operating profit, percentage change		31.60%		(2.70%)
Aerospace and Defense Electronics
Net sales(a):
Net sales	[1]	$ 151.3	151.8	$ 439.5	457.3
Net sales, percentage change	[1]	(0.30%)		(3.90%)
Aerospace and Defense Electronics | Operating Segments
Operating income:
Total segment operating profit		$ 23.5	21.6	$ 63.5	68.3
Total segment operating profit, percentage change		8.80%		(7.00%)
Engineered Systems
Net sales(a):
Net sales	[1]	$ 65.2	73.3	$ 196.9	197.3
Net sales, percentage change	[1]	(11.10%)		(0.20%)
Engineered Systems | Operating Segments
Operating income:
Total segment operating profit		$ 5.9	$ 8.5	$ 17.4	$ 21.4
Total segment operating profit, percentage change		(30.60%)		(18.70%)

[1] (a)Net sales excludes inter-segment sales of $4.8 million and $14.7 million for the third quarter and nine months ended September 27, 2015, respectively, and $4.9 million and $14.8 million for the third quarter and nine months ended September 28, 2014, respectively.