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Mergers and Acquisitions - Narratives (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended 19 Months Ended
Oct. 02, 2017
USD ($)
Feb. 28, 2017
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Jul. 02, 2018
USD ($)
Jun. 29, 2018
$ / shares
Business Acquisition [Line Items]                                        
Fiber Route Miles         16,500                              
Business Combination, Consideration Transferred, Cash Previously Restricted         $ 16.5                              
Proceeds from (Repayments of) Lines of Credit                           $ 194.6   $ (89.5) $ 71.9      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares       7.7                                
Business Acquisition, Share Price | $ / shares                                       $ 15.70
Acquisition costs     $ 4.3 $ 13.3   $ 2.7 $ 2.2   $ 4.1 $ 12.1 $ 1.7 $ 0.6   22.5   18.5 0.0      
Goodwill     157.0         $ 151.0 151.0       $ 157.0 157.0   151.0 14.3 $ 157.0    
Revenues     399.0 386.7   296.8 295.7   301.2 255.5 259.4 249.6   1,378.2   1,065.7 1,017.6      
Net income (loss)     (30.0) (17.7)   $ (13.8) (8.3)   (11.9) $ (11.0) $ 2.3 $ 60.6   (69.8)   40.0 $ 103.0      
Hawaiian Telcom Holdco, Inc. [Member]                                        
Business Acquisition [Line Items]                                        
Total estimated purchase price         $ 339.5                              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares         7.7                              
Acquisition costs                           19.2   8.0   27.2    
Property, plant and equipment                                     $ 701.5  
Intangible assets                                     52.0  
Goodwill                                     $ 8.8  
OnX Holdings LLC [Member]                                        
Business Acquisition [Line Items]                                        
Working capital adjustment $ 2.8                                      
Total estimated purchase price $ 166.4                                      
Acquisition costs                           0.5 $ 8.6 8.1        
Ownership interest acquired 100.00%                                      
Business Combination, Debt Repayment (Excluding Capital Leases), Including Accrued Interest $ 77.6                                      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred             $ 2.8                          
Property, plant and equipment 11.6                                      
Intangible assets 134.0                                      
Goodwill $ 133.1                                      
Goodwill expected to be tax deductible     2.3                   2.3 2.3       2.3    
SunTel Services [Member]                                        
Business Acquisition [Line Items]                                        
Total estimated purchase price   $ 10.0                                    
Ownership interest acquired   100.00%                                    
Property, plant and equipment   $ 0.4                                    
Intangible assets   1.2                                    
Working capital adjustment   4.1                                    
Goodwill   $ 4.6                                    
Hawaiian Telcom Holdco, Inc. [Member]                                        
Business Acquisition [Line Items]                                        
Revenues                         175.0              
Net income (loss)                         0.7              
OnX Holdings LLC [Member]                                        
Business Acquisition [Line Items]                                        
Revenues               53.0                        
Net income (loss)               11.5                        
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                              
8% Senior Notes due 2025 [Member]                                        
Business Acquisition [Line Items]                                        
Senior Notes, Noncurrent     $ 350.0 $ 350.0 $ 350.0     $ 350.0 $ 350.0       $ 350.0 $ 350.0   $ 350.0   $ 350.0