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Mergers and Acquisitions - Narratives (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 22 Months Ended
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
shares
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 29, 2018
$ / shares
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Gross $ 0.0   $ 2.8      
Fiber Route Miles 16,700          
Business Combination, Consideration Transferred, Cash Previously Restricted   $ 16.5        
Proceeds from (Repayments of) Lines of Credit $ (3.8)   0.0      
Business Acquisition, Share Price | $ / shares           $ 15.70
Business Combination, Acquisition Related Costs 3.0   2.2      
Hawaiian Telcom Holdco, Inc. [Member]            
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Gross   218.3        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   121.2        
Business Combination, Debt Repayment, Including Accrued Interest   $ 318.2        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares   7.7        
Business Combination, Acquisition Related Costs 0.5   $ 1.6 $ 27.7    
8% Senior Notes due 2025 [Member]            
Business Acquisition [Line Items]            
Senior Notes, Noncurrent $ 350.0 $ 350.0   $ 350.0 $ 350.0  
Revolving Credit Facility [Member] | Hawaiian Telcom Holdco, Inc. [Member]            
Business Acquisition [Line Items]            
Proceeds from (Repayments of) Lines of Credit   35.0        
Accounts Receivable Securitization Facility [Member] | Hawaiian Telcom Holdco, Inc. [Member]            
Business Acquisition [Line Items]            
Proceeds from (Repayments of) Lines of Credit   $ 154.0