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Segment Information (Segment Profit And Reconciliation To Operating Loss By Segment) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 30, 2012
Apr. 01, 2011
Segment Reporting Information [Line Items]    
Total segment profit $ 31.4 $ 45.7
Sales and marketing expenses (36.4) (44.7)
General and administrative expenses (21.1) (23.7)
Equity-based compensation (2.6) (3.7)
Intangible asset amortization (2.2) (5.2)
Restructuring and other charges (106.0) (1.0)
Operating Loss (136.9) (32.6)
Broadband Segment [Member]
   
Segment Reporting Information [Line Items]    
Total segment profit 8.0 19.7
Transport Segment [Member]
   
Segment Reporting Information [Line Items]    
Total segment profit 8.2 16.0
Services Segment [Member]
   
Segment Reporting Information [Line Items]    
Total segment profit $ 15.2 $ 10.0