Restructuring And Other Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2012	Apr. 01, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 106.0	$ 1.0
Accelerated Amortization Of Intangible Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	47.7
Severance And Other Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	24.1	1.2
January 2012 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	104.5
Expected workforce reductions	510
Expected total cash payments	31.4
January 2012 Restructuring Plan [Member] | Accelerated Amortization Of Intangible Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	47.7
Expected pretax charges	48
January 2012 Restructuring Plan [Member] | Severance And Other Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	22.9
Expected pretax charges	23
January 2012 Restructuring Plan [Member] | Facility- And Asset-Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	32.7
Expected pretax charges	36
January 2012 Restructuring Plan [Member] | Other Obligation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	1.2
January 2012 Restructuring Plan [Member] | Broadband Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date	98.9
January 2012 Restructuring Plan [Member] | Transport Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date	3.1
January 2012 Restructuring Plan [Member] | Services Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date	2.5
July 2011 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	1.6
Cumulative pretax restructuring charges incurred to date	21.3
Expected workforce reductions	280
Expected pretax charges	22
Expected total cash payments	18.6
July 2011 Restructuring Plan [Member] | Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	1.3
July 2011 Restructuring Plan [Member] | Severance And Other Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date	15.8
Expected pretax charges	16
July 2011 Restructuring Plan [Member] | Facility- And Asset-Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0.3
Cumulative pretax restructuring charges incurred to date	4.9
Expected pretax charges	6
July 2011 Restructuring Plan [Member] | Other Obligation [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date	0.6
July 2011 Restructuring Plan [Member] | Broadband Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date	10.9
July 2011 Restructuring Plan [Member] | Transport Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date	5.0
July 2011 Restructuring Plan [Member] | Services Segment [Member]
Restructuring Cost and Reserve [Line Items]
Cumulative pretax restructuring charges incurred to date	5.4
Previous Restructuring Plans [Member] | Severance And Other Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ (0.1)