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Description of Business and Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jul. 27, 2017
Jul. 09, 2017
Dec. 31, 2016
Oct. 05, 2016
Oct. 04, 2016
Number of customers that exceed 10% of total accounts receivable   1     1            
Accounts Receivable from customers greater than 10%, percentage   17.00%     17.00%       21.00%    
Revenue from customers greater than 10%, percentage       12.00%   11.00%          
Common Stock, Par or Stated Value Per Share   $ 0.01     $ 0.01     $ 0.01 $ 0.01    
Committed senior secured credit facilities             $ 1,130.0 $ 1,100.0      
Common Stock, Shares, Issued   42,173,872     42,173,872       42,056,237 42,055,001 210,275,005
Total Par Value, Amount, reclassified                   $ 1.7  
Available-for-Sale Securities, Shares Sold     2,800,000                
Proceeds from Sale of Available-for-sale Securities, Equity     $ 140.7   $ 140.7 $ 142.5          
Gain on sale of Investment in CyrusOne   $ 0.0 (117.7) $ (118.6) (117.7) $ (118.6)          
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax   7.8     $ 7.8       $ 14.5    
Income Tax Credits and Adjustments   $ 14.5                  
Hawaiian Telcom Holdco, Inc. [Member]                      
Common Stock, Par or Stated Value Per Share               $ 0.01      
Business combination exchange ratio, Share Consideration 1.6305                    
Business combination exchange ratio, shares, Mixed Consideration 0.6522                    
Business combination exchange ratio, cash, Mixed Consideration $ 18.45                    
Business combination exchange ratio, Cash Consideration $ 30.75                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt     290.0                
Business Combination, Consideration Transferred $ 360.0                    
OnX Holdings LLC [Member]                      
Business Combination, Consideration Transferred $ 201.0                    
SunTel Services [Member]                      
Business Combination, Consideration Transferred     10.0                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     0.4                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     1.2                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital     4.1                
Goodwill, Acquired During Period     $ 4.3