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Segment Information (Segment Profit And Reconciliation To Operating (Loss) Earnings By Segment) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 30, 2011
Dec. 31, 2010
Jan. 01, 2010
Segment Reporting Information [Line Items]      
Total segment profit $ 196.1 $ 502.4 $ 406.9
Sales and marketing expenses (163.0) (179.3) (165.9)
General and administrative expenses (80.9) (100.4) (101.4)
Equity-based compensation (11.9) (12.5) (9.8)
Intangible asset amortization (20.2) (27.0) (24.6)
Restructuring and other charges (20.3) (9.5) (11.7)
Goodwill and IPR&D impairment (102.7)      
Operating (loss) earnings (202.9) 173.7 93.5
Broadband Segment [Member]
     
Segment Reporting Information [Line Items]      
Total segment profit 54.0 229.4 185.7
Transport Segment [Member]
     
Segment Reporting Information [Line Items]      
Total segment profit 66.8 191.8 139.4
Services Segment [Member]
     
Segment Reporting Information [Line Items]      
Total segment profit $ 75.3 $ 81.2 $ 81.8