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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
Oct. 26, 2021
Sep. 30, 2021
Ntelos Holding, Corp | Ntelos Pension Plan    
Subsequent Event [Line Items]    
Benefit obligations, at acquisition   $ 6.2
Subsequent Event    
Subsequent Event [Line Items]    
Dividends payable (in dollars per share) $ 0.07