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Restructuring and Severance (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]            
Restructuring Reserve, Current $ 8.8     $ 8.8   $ 12.0
Restructuring Reserve, Noncurrent 2.4     2.4   $ 2.5
Restructuring Reserve [Roll Forward]            
Beginning balance 7.5 $ 14.5   14.5    
Charges 4.6 0.3 $ 3.6 4.9 $ 29.2  
Utilizations (0.9) (7.3)        
Ending balance 11.2 7.5   11.2    
Entertainment and Communications [Member]            
Restructuring Reserve [Roll Forward]            
Beginning balance 6.6 12.3   12.3    
Charges 0.0 0.0        
Utilizations (0.3) (5.7)        
Ending balance 6.3 6.6   6.3    
IT Services and Hardware [Member]            
Restructuring Reserve [Roll Forward]            
Beginning balance 0.9 2.2   2.2    
Charges 4.6 0.3        
Utilizations (0.6) (1.6)        
Ending balance 4.9 0.9   4.9    
Corporate Segment [Member]            
Restructuring Reserve [Roll Forward]            
Beginning balance 0.0 0.0   0.0    
Charges 0.0 0.0        
Utilizations 0.0 0.0        
Ending balance 0.0 0.0   0.0    
Employee Severance [Member]            
Restructuring Reserve [Roll Forward]            
Beginning balance 7.4 14.4   14.4    
Charges 3.8 0.3        
Utilizations (0.9) (7.3)        
Ending balance 10.3 7.4   10.3    
Lease Abandonment [Member]            
Restructuring Reserve [Roll Forward]            
Beginning balance 0.1 0.1   0.1    
Charges 0.8 0.0        
Utilizations 0.0 0.0        
Ending balance $ 0.9 $ 0.1   $ 0.9