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Mergers and Acquisitions - Schedule of Consideration (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 02, 2017
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Hawaiian Telcom Holdco, Inc. [Member]        
Consideration Transferred        
Cash consideration plus debt assumed   $ 536.5    
Cash consideration   218.3    
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   121.2    
Debt repayment   (318.2)    
Total purchase price   339.5    
OnX Holdings LLC [Member]        
Consideration Transferred        
Cash consideration $ 241.2      
Debt repayment (77.6)      
Working capital adjustment 2.8      
Total purchase price $ 166.4      
8% Senior Notes due 2025 [Member]        
Business Acquisition [Line Items]        
Senior Notes, Noncurrent   $ 350.0 $ 350.0 $ 350.0