Goodwill and Other Intangible Assets - Rollforward (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Jun. 28, 2014	Sep. 27, 2014		Dec. 31, 2013
Goodwill [Roll Forward]
Gross goodwill, beginning balance		$ 373.5	[1]
Impairment losses		(4.4)	[1]	0	[1]
Net goodwill		474.4	[1]	373.5	[1]
Goodwill purchase adjustment		105.3	[2]
Goodwill impairment loss	(4.4)	(4.4)	[2]
Total Goodwill Adjustments		100.9	[2]
Gross goodwill, ending balance		478.8	[1]
AQH
Goodwill [Roll Forward]
Gross goodwill, beginning balance		156.8	[1]
Impairment losses		0	[1]	0	[1]
Net goodwill		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]
SCS
Goodwill [Roll Forward]
Gross goodwill, beginning balance		80.9	[1]
Impairment losses		0	[1]	0	[1]
Net goodwill		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]
ERG
Goodwill [Roll Forward]
Gross goodwill, beginning balance		131.4	[1]
Impairment losses		0	[1]	0	[1]
Net goodwill		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]
RCH
Goodwill [Roll Forward]
Gross goodwill, beginning balance		0	[1]
Impairment losses		0	[1]	0	[1]
Net goodwill		105.3	[1]	0	[1]
Goodwill purchase adjustment		105.3	[2]
Goodwill impairment loss		0	[2]
Total Goodwill Adjustments		105.3	[2]
Gross goodwill, ending balance		105.3	[1]
AVC
Goodwill [Roll Forward]
Gross goodwill, beginning balance		4.4	[1],[3]
Impairment losses		(4.4)	[1],[3]	0	[1],[3]
Net goodwill		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]

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

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

[3] Represents the combined audio, video and control solutions reporting units.