Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles (Universal Service Fund) (Details)

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Summary of Significant Accounting Principles (Universal Service Fund) (Details) - USF Program - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Revenue support from regulatory agency, percentage 24.00% 23.00%
Receivables net, current $ 151.2 $ 91.3