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Mergers and Acquisitions - Narratives (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 28 Months Ended
Jul. 02, 2018
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
mi
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]              
Fiber route miles | mi       17,000      
Previously restricted to fund interest payments $ 16.5            
Revolving credit facility       $ (8.1) $ 194.2    
Expenses related to acquisition   $ 0.2 $ 13.3 3.8 18.2    
8% Senior Notes due 2025 [Member]              
Business Acquisition [Line Items]              
Senior notes 350.0 350.0   350.0   $ 350.0 $ 350.0
Hawaiian Telcom Holdco, Inc. [Member]              
Business Acquisition [Line Items]              
Cash consideration 218.3            
Stock consideration 121.2            
Debt repayments, including accrued interest $ 318.2            
Common shares issued as stock consideration | shares 7.7            
Common shares price per share as stock consideration | $ / shares $ 15.70            
Expenses related to acquisition   $ 0.0 $ 13.3 $ 0.9 $ 16.9 $ 28.1  
Hawaiian Telcom Holdco, Inc. [Member] | Revolving Credit Facility [Member]              
Business Acquisition [Line Items]              
Revolving credit facility $ 35.0            
Hawaiian Telcom Holdco, Inc. [Member] | Accounts Receivable Securitization Facility [Member]              
Business Acquisition [Line Items]              
Revolving credit facility $ 154.0