Restructuring And Other Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended					3 Months Ended	6 Months Ended
	Jul. 02, 2010	Jul. 01, 2011	Jul. 02, 2010	Jul. 02, 2010 Severance And Other Termination Benefits [Member]	Jul. 01, 2011 Severance And Other Termination Benefits [Member]	Jul. 02, 2010 Severance And Other Termination Benefits [Member]	Jul. 02, 2010 Facility- And Asset-Related Charges [Member]	Jul. 01, 2011 Facility- And Asset-Related Charges [Member]	Jul. 02, 2010 Facility- And Asset-Related Charges [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Severance And Other Termination Benefits [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Severance And Other Termination Benefits [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Facility- And Asset-Related Charges [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Broadband Segment [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Transport Segment [Member]	Jul. 01, 2011 January 2010 Restructuring Plan [Member] Services Segment [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member] Severance And Other Termination Benefits [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member] Facility- And Asset-Related Charges [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member] Broadband Segment [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member] Transport Segment [Member]	Jul. 01, 2011 July 2009 Restructuring Plan [Member] Services Segment [Member]	Jul. 01, 2011 Restructuring Plans Prior To 2009 [Member] Facility- And Asset-Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Expected total cash payments										$ 7.0									$ 6.7
Restructuring expense	(0.5)	1.0	9.5	(0.5)	1.2	7.1		(0.2)	2.4		0.1	0.6					0.1		0.6					(0.2)
Cumulative pretax restructuring charges incurred to date										9.6		7.0	2.6	6.1	3.2	0.3		7.0	6.6	0.4	2.6	2.1	2.3
Cumulative cash payments										$ 5.9									$ 5.9