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Mergers and Acquisitions - Narratives (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 16 Months Ended
Oct. 02, 2017
USD ($)
Feb. 28, 2017
USD ($)
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jul. 02, 2018
USD ($)
Jun. 29, 2018
$ / shares
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]                            
Revenues     $ 386.7     $ 255.5 $ 979.2 $ 764.5            
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life, in Years     14.3                      
Fiber Route Miles       16,000                    
Business Combination, Consideration Transferred, Cash Previously Restricted       $ 16.5                    
Proceeds from (Repayments of) Lines of Credit             194.2 (89.5)            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares     7.7                      
Business Acquisition, Share Price | $ / shares                         $ 15.70  
Business Combination, Acquisition Related Costs     $ 13.3     12.1 18.2 14.4            
Property, plant, and equipment                       $ 701.8    
Goodwill     158.0 158.0     158.0   $ 158.0   $ 158.0     $ 151.0
Net Income (Loss) Attributable to Parent     (17.7)     (11.0) (39.8) 51.9            
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     13.3     5.3 16.9 5.7     23.6      
Business Combination, Consideration Transferred       $ 339.5                    
Property, plant, and equipment                       701.8    
Intangible assets, other than goodwill                       52.0    
Goodwill                       $ 7.6    
OnX Holdings LLC [Member]                            
Business Acquisition [Line Items]                            
Business Combination, Acquisition Related Costs     0.0     $ 4.4 0.5 $ 5.5   $ 8.6        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%                          
Business Combination, Debt Repayment (Excluding Capital Leases), Including Accrued Interest $ 77.6               (77.6)          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred         $ 2.8       2.8          
Business Combination, Consideration Transferred                 166.4          
Property, plant, and equipment 11.6                          
Intangible assets, other than goodwill 134.0                          
Goodwill $ 133.1                          
SunTel Services [Member]                            
Business Acquisition [Line Items]                            
Business Acquisition, Percentage of Voting Interests Acquired   100.00%                        
Business Combination, Consideration Transferred   $ 10.0                        
Property, plant, and equipment   0.4                        
Intangible assets, other than goodwill   1.2                        
Working capital adjustment   4.1                        
Goodwill   $ 4.6                        
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
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                    
Hawaiian Telcom Holdco, Inc. [Member]                            
Business Acquisition [Line Items]                            
Revenues       87.1                    
Net Income (Loss) Attributable to Parent       $ 0.5