Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Summary of Significant Accounting Policies [Abstract]
Universal Service Fund (USF) surcharges from customers (primarily federal USF) included in revenue and expenses	$ 26.1	$ 11.4	$ 54.2	$ 21.7
Number of operating segments	6		6
Number of reportable segments	1		1