BASIS OF PRESENTATION (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012 Reclassifications Wireline revenue	Sep. 30, 2012 Reclassifications Wireline revenue	Sep. 30, 2012 Reclassifications Termination and access fees	Sep. 30, 2012 Reclassifications Termination and access fees	Sep. 30, 2012 Reclassifications Engineering and operations expense	Sep. 30, 2012 Reclassifications Engineering and operations expense	Sep. 30, 2012 Reclassifications General and administrative expense	Sep. 30, 2012 Reclassifications General and administrative expense	Sep. 30, 2013 Reclassifications Other Income
BASIS OF PRESENTATION
Effective tax rate (as a percent)	35.50%	31.30%
Tax benefit related to certain non-recurring tax credits		$ 1.3
Reclassifications
Prior period reclassifications			$ (0.4)	$ (0.8)	$ 0.4	$ 0.8	$ 0.8	$ 2.4	$ (0.8)	$ (2.4)	$ 0.6