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Revenues Revenue from External Customers by Geographic Areas (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Billboard $ 298.2 $ 223.6
Transit and other 75.3 35.6
Revenues 373.5 259.2
United States    
Disaggregation of Revenue [Line Items]    
Billboard 283.4 212.5
Revenues 356.0 246.1
Canada    
Disaggregation of Revenue [Line Items]    
Revenues 17.5 13.1
Transit and other    
Disaggregation of Revenue [Line Items]    
Transit and other 73.5 34.9
Transit and other | United States    
Disaggregation of Revenue [Line Items]    
Transit and other 70.8 32.9
Other    
Disaggregation of Revenue [Line Items]    
Billboard 10.8 9.2
Transit and other 6.4 4.6
Other Revenues    
Disaggregation of Revenue [Line Items]    
Transit and other 1.8 0.7
Other Revenues | United States    
Disaggregation of Revenue [Line Items]    
Transit and other $ 1.8 $ 0.7