Annual report pursuant to Section 13 and 15(d)

Receivables and Allowance for Doubtful Receivables (Narrative) (Details)

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Receivables and Allowance for Doubtful Receivables (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2013
USF Program [Member]
Jul. 22, 2013
USF Program [Member]
Dec. 31, 2012
USF Program [Member]
Dec. 31, 2011
USF Program [Member]
Dec. 31, 2012
Rural Health Care Division [Member]
Jan. 31, 2014
Subsequent Event [Member]
USF Program [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Revenue support from regulatory agency, percentage     19.00% 19.00%    
Receivables net current $ 124.3   $ 70.1      
Contribution receivables   14.2        
Proceeds from regulatory agency         $ 1.6 $ 18.5