Segment Information (Segment Profit And Reconciliation To Operating (Loss) Earnings By Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010
Segment Reporting Information [Line Items]
Total segment profit		$ 142.9		$ 426.7
Sales and marketing expenses		(43.6)		(132.5)
General and administrative expenses		(24.0)		(73.7)
Equity-based compensation		(3.5)		(9.7)
Intangible asset amortization		(6.1)		(20.9)
Restructuring and other charges	(19.5)		(20.5)	(9.5)
Goodwill and IPR&D impairment
Operating (Loss) Earnings		65.7		180.4
Broadband Segment [Member]
Segment Reporting Information [Line Items]
Total segment profit		48.8		195.7
Transport Segment [Member]
Segment Reporting Information [Line Items]
Total segment profit		71.6		168.3
Services Segment [Member]
Segment Reporting Information [Line Items]
Total segment profit		22.5		62.7
Restated [Member]
Segment Reporting Information [Line Items]
Total segment profit	58.6		140.3
Sales and marketing expenses	(41.4)		(126.9)
General and administrative expenses	(18.6)		(63.3)
Equity-based compensation	(3.1)		(11.1)
Intangible asset amortization	(5.0)		(15.3)
Restructuring and other charges	(19.5)		(20.5)
Goodwill and IPR&D impairment	(102.7)		(102.7)
Operating (Loss) Earnings	(131.7)		(199.5)
Restated [Member] | Broadband Segment [Member]
Segment Reporting Information [Line Items]
Total segment profit	28.4		38.1
Restated [Member] | Transport Segment [Member]
Segment Reporting Information [Line Items]
Total segment profit	7.4		47.8
Restated [Member] | Services Segment [Member]
Segment Reporting Information [Line Items]
Total segment profit	$ 22.8		$ 54.4