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Restructuring Charges - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 0.3 $ 2.1 $ 6.4
Restructuring Reserve 0.4    
Operating segments | U.S. Media      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   0.9 2.3
Operating segments | Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   0.8 $ 4.1
Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 0.3 $ 0.4