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Restructuring Charges - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 0.0 $ 0.2 $ 0.3 $ 1.3
Restructuring reserve $ 0.6   $ 0.6  
Operating segments | Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   $ 0.2   0.8
Operating segments | U.S. Media        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       $ 0.5