Goodwill and Intangible Assets Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill [Line Items]
Goodwill, Gross	$ 340.9	$ 341.7
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]
Goodwill, Impaired, Accumulated Impairment Loss	50.3	0
Goodwill [Roll Forward]
Goodwill	341.7	71.9
Business acquisitions		269.8
Impairment	(50.3)	0	0
Dispostion of home security business	(0.8)
Goodwill	290.6	341.7	71.9
Goodwill and Intangible Assets Disclosure [Abstract]
Loss on sale of assets	8.4	0	(4.8)
Wireless [Member]
Goodwill [Roll Forward]
Goodwill	50.3	50.3
Business acquisitions		0
Impairment	(50.3)
Dispostion of home security business	0
Goodwill	0	50.3
Wireline [Member]
Goodwill [Roll Forward]
Goodwill	12.6	12.6
Business acquisitions		0
Impairment	0
Dispostion of home security business	(0.8)
Goodwill	11.8	12.6
Data Center Colocation [Member]
Goodwill [Roll Forward]
Goodwill	276.3	6.7
Business acquisitions		269.6
Impairment	0
Dispostion of home security business	0
Goodwill	276.3	276.3
IT Services and Hardware [Member]
Goodwill [Roll Forward]
Goodwill	2.5	2.3
Business acquisitions		0.2
Impairment	0
Dispostion of home security business	0
Goodwill	$ 2.5	$ 2.5