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Commitment and Contingencies - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Displays
Jun. 30, 2019
USD ($)
Displays
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Other Commitments [Line Items]        
MTA equipment development cost additions | $   $ 71.1   $ 91.2
MTA digital advertising screens on subway and train platforms        
Other Commitments [Line Items]        
Number of displays 8,565 8,565    
MTA smaller-format digital advertising screens rolling stock        
Other Commitments [Line Items]        
Number of displays 37,716 37,716    
MTA communication displays        
Other Commitments [Line Items]        
Number of displays 7,829 7,829    
MTA displays installed        
Other Commitments [Line Items]        
Number of displays 2,768 2,768    
Number of display additions 804 1,539    
Standalone letters of credit and sublimit to revolving credit facility [Member]        
Other Commitments [Line Items]        
Letters of credit outstanding, amount | $ $ 209.0 $ 209.0    
Surety Bond        
Other Commitments [Line Items]        
Surety bonds outstanding | $ $ 26.6 $ 26.6    
Subsequent Event        
Other Commitments [Line Items]        
MTA equipment development cost additions | $     $ 150.0