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Restructuring and Severance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jul. 02, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]                
Restructuring Reserve, Current $ 6.5       $ 6.5     $ 12.0
Restructuring Reserve, Noncurrent 2.0       2.0     $ 2.5
Restructuring Reserve [Roll Forward]                
Beginning balance 11.2 $ 7.5 $ 14.5   14.5      
Charges 0.0 4.6 0.3 $ 0.0 4.9 $ 29.2    
Hawaiian Telcom opening balance sheet adjustment             $ 3.8  
Utilizations (6.5) (0.9) (7.3)          
Ending balance 8.5 11.2 7.5   8.5      
Entertainment and Communications [Member]                
Restructuring Reserve [Roll Forward]                
Beginning balance 6.3 6.6 12.3   12.3      
Charges 0.0 0.0 0.0          
Hawaiian Telcom opening balance sheet adjustment             3.8  
Utilizations (3.4) (0.3) (5.7)          
Ending balance 6.7 6.3 6.6   6.7      
IT Services and Hardware [Member]                
Restructuring Reserve [Roll Forward]                
Beginning balance 4.9 0.9 2.2   2.2      
Charges 0.0 4.6 0.3          
Hawaiian Telcom opening balance sheet adjustment             0.0  
Utilizations (3.1) (0.6) (1.6)          
Ending balance 1.8 4.9 0.9   1.8      
Employee Severance [Member]                
Restructuring Reserve [Roll Forward]                
Beginning balance 10.3 7.4 14.4   14.4      
Charges 0.0 3.8 0.3   4.1      
Hawaiian Telcom opening balance sheet adjustment             3.8  
Utilizations (6.4) (0.9) (7.3)          
Ending balance 7.7 10.3 7.4   7.7      
Lease Abandonment [Member]                
Restructuring Reserve [Roll Forward]                
Beginning balance 0.9 0.1 0.1   0.1      
Charges 0.0 0.8 0.0          
Hawaiian Telcom opening balance sheet adjustment             $ 0.0  
Utilizations (0.1) 0.0 0.0          
Ending balance $ 0.8 $ 0.9 $ 0.1   $ 0.8