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Restructuring Charges - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 0.0 $ 0.1 $ 0.3 $ 1.4
Restructuring reserve $ 0.5   0.5  
Operating segments | Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       0.8
Operating segments | U.S. Media        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   $ 0.1   $ 0.6
Corporate        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     $ 0.3