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Restructuring and Severance (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Current $ 13.2   $ 7.4
Restructuring Reserve, Noncurrent 10.9   $ 3.8
Restructuring Reserve [Roll Forward]      
Beginning balance 11.2    
Charges 25.6 $ 0.0  
Utilizations (12.7)    
Ending balance 24.1    
Entertainment and Communications [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 7.5    
Charges 25.6    
Utilizations (9.8)    
Ending balance 23.3    
IT Services and Hardware [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 3.0    
Charges 0.0    
Utilizations (2.3)    
Ending balance 0.7    
Corporate Segment [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 0.7    
Charges 0.0    
Utilizations (0.6)    
Ending balance 0.1    
Employee Severance [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 11.0    
Charges 25.6    
Utilizations (12.7)    
Ending balance 23.9    
Lease Abandonment [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 0.2    
Charges 0.0    
Utilizations 0.0    
Ending balance $ 0.2