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Restructuring and Severance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]              
Restructuring Reserve, Current $ 4.7       $ 4.7   $ 7.4
Restructuring Reserve, Noncurrent 8.7       8.7   $ 3.8
Restructuring Reserve [Roll Forward]              
Beginning Balance 23.3 $ 24.1 $ 11.2   11.2    
Charges 0.0 3.6 25.6 $ 0.0 29.2 $ 0.0  
Utilizations (9.9) (4.4) (12.7)        
Ending Balance 13.4 23.3 24.1   13.4    
Entertainment and Communications [Member]              
Restructuring Reserve [Roll Forward]              
Beginning Balance 21.0 23.3 7.5   7.5    
Charges 0.0 1.3 25.6        
Utilizations (8.1) (3.6) (9.8)        
Ending Balance 12.9 21.0 23.3   12.9    
IT Services and Hardware [Member]              
Restructuring Reserve [Roll Forward]              
Beginning Balance 2.2 0.7 3.0   3.0    
Charges 0.0 2.3 0.0        
Utilizations (1.7) (0.8) (2.3)        
Ending Balance 0.5 2.2 0.7   0.5    
Corporate Segment [Member]              
Restructuring Reserve [Roll Forward]              
Beginning Balance 0.1 0.1 0.7   0.7    
Charges 0.0 0.0 0.0        
Utilizations (0.1) 0.0 (0.6)        
Ending Balance 0.0 0.1 0.1   0.0    
Employee Severance [Member]              
Restructuring Reserve [Roll Forward]              
Beginning Balance 23.1 23.9 11.0   11.0    
Charges 0.0 3.6 25.6        
Utilizations (9.8) (4.4) (12.7)        
Ending Balance 13.3 23.1 23.9   13.3    
Facility Closing [Member]              
Restructuring Reserve [Roll Forward]              
Beginning Balance 0.2 0.2 0.2   0.2    
Charges 0.0 0.0 0.0        
Utilizations (0.1) 0.0 0.0        
Ending Balance $ 0.1 $ 0.2 $ 0.2   $ 0.1