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Commitment and Contingencies - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Displays
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Displays
Dec. 31, 2018
USD ($)
Other Commitments [Line Items]        
MTA Equipment Development Cost Additions | $     $ 150.8 $ 91.2
MTA digital advertising screens on subway and train platforms and entrances        
Other Commitments [Line Items]        
Number Of Displays | Displays 8,565   8,565  
MTA smaller-format digital advertising screens rolling stock        
Other Commitments [Line Items]        
Number Of Displays | Displays 37,716   37,716  
MTA communication displays        
Other Commitments [Line Items]        
Number Of Displays | Displays 7,829   7,829  
MTA displays installed        
Other Commitments [Line Items]        
Number Of Displays | Displays 4,577   4,577  
Number Of Display Additions | Displays 837   3,348  
Letter of Credit        
Other Commitments [Line Items]        
Letters of credit outstanding | $ $ 70.9   $ 70.9  
Standalone letters of credit and sublimit to revolving credit facility        
Other Commitments [Line Items]        
Letters of credit outstanding | $ 72.5   72.5  
Surety Bond        
Other Commitments [Line Items]        
Surety Bonds Outstanding | $ $ 162.1   $ 162.1  
Subsequent event        
Other Commitments [Line Items]        
MTA Equipment Development Cost Additions | $   $ 175.0