Goodwill and Other Intangible Assets - Rollforward (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014		Jun. 28, 2014		Dec. 31, 2013
Goodwill [Roll Forward]
Gross goodwill, beginning balance			$ 373.5	[1]
Impairment losses	(4.4)	[1]	(4.4)	[1]	0	[1]
Net goodwill	479.7	[1]	479.7	[1]	373.5	[1]
Goodwill purchase adjustment			110.6	[2]
Goodwill impairment loss	(4.4)		(4.4)	[2]
Total Goodwill Adjustments			106.2	[2]
Gross goodwill, ending balance	484.1	[1]	484.1	[1]
RESV [Member]
Goodwill [Roll Forward]
Gross goodwill, beginning balance			156.8	[1]
Impairment losses	0	[1]	0	[1]	0	[1]
Net goodwill	156.8	[1]	156.8	[1]	156.8	[1]
Goodwill purchase adjustment			0	[2]
Goodwill impairment loss			0	[2]
Total Goodwill Adjustments			0	[2]
Gross goodwill, ending balance	156.8	[1]	156.8	[1]
TECH [Member]
Goodwill [Roll Forward]
Gross goodwill, beginning balance			80.9	[1]
Impairment losses	0	[1]	0	[1]	0	[1]
Net goodwill	80.9	[1]	80.9	[1]	80.9	[1]
Goodwill purchase adjustment			0	[2]
Goodwill impairment loss			0	[2]
Total Goodwill Adjustments			0	[2]
Gross goodwill, ending balance	80.9	[1]	80.9	[1]
DMS [Member]
Goodwill [Roll Forward]
Gross goodwill, beginning balance			131.4	[1]
Impairment losses	0	[1]	0	[1]	0	[1]
Net goodwill	131.4	[1]	131.4	[1]	131.4	[1]
Goodwill purchase adjustment			0	[2]
Goodwill impairment loss			0	[2]
Total Goodwill Adjustments			0	[2]
Gross goodwill, ending balance	131.4	[1]	131.4	[1]
RHC [Member]
Goodwill [Roll Forward]
Gross goodwill, beginning balance			0	[1]
Impairment losses	0	[1]	0	[1]	0	[1]
Net goodwill	110.6	[1]	110.6	[1]	0	[1]
Goodwill purchase adjustment			110.6	[2]
Goodwill impairment loss			0	[2]
Total Goodwill Adjustments			110.6	[2]
Gross goodwill, ending balance	110.6	[1]	110.6	[1]
AV [Member]
Goodwill [Roll Forward]
Gross goodwill, beginning balance			4.4	[1],[3]
Impairment losses	(4.4)	[1],[3]	(4.4)	[1],[3]	0	[1],[3]
Net goodwill	0	[1],[3]	0	[1],[3]	4.4	[1],[3]
Goodwill purchase adjustment			0	[2],[3]
Goodwill impairment loss			(4.4)	[2],[3]
Total Goodwill Adjustments			(4.4)	[2],[3]
Gross goodwill, ending balance	$ 4.4	[1],[3]	$ 4.4	[1],[3]

[1] The CES reporting unit did not have goodwill for any periods presented.

[2] Acquisition adjustments recorded during the first half of 2014 for the RHC segment relate to the acquisition of Reznor. See Note B, “Acquisitions”.

[3] Represents the combined audio/video reporting units.