Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Summary of Significant Accounting Policies [Abstract]
Universal Service Fund (USF) surcharges from customers (primarily federal USF) included in revenue and expenses	$ 24.5	$ 26.9	$ 78.7	$ 48.7
Number of operating segments	6		6
Number of reportable segment	1		1