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Restructuring and Severance - Summary of Restructuring Activity by Business Segment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring Reserve [Roll Forward]          
Beginning balance $ 9.8 $ 2.9   $ 2.9  
Charges 0.4 15.2 $ 1.8 15.6 $ 5.1
Utilizations (3.5) (8.3)      
Ending balance 6.7 9.8   6.7  
Operating Segments [Member] | Entertainment and Communications [Member]          
Restructuring Reserve [Roll Forward]          
Beginning balance 9.6 2.4   2.4  
Charges 0.0 14.8      
Utilizations (3.1) (7.6)      
Ending balance 6.5 9.6   6.5  
Operating Segments [Member] | IT Services and Hardware [Member]          
Restructuring Reserve [Roll Forward]          
Beginning balance 0.2 0.5   0.5  
Charges 0.3 0.4      
Utilizations (0.4) (0.7)      
Ending balance 0.1 0.2   0.1  
Corporate, Non-Segment [Member]          
Restructuring Reserve [Roll Forward]          
Beginning balance 0.0 0.0   0.0  
Charges 0.1 0.0      
Utilizations 0.0 0.0      
Ending balance $ 0.1 $ 0.0   $ 0.1