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Revenues Revenue from External Customers by Geographic Areas (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Billboard $ 373.4 $ 371.6 $ 702.2 $ 692.2
Transit and other 103.9 97.2 183.6 172.4
Revenues 477.3 468.8 885.8 864.6
United States        
Disaggregation of Revenue [Line Items]        
Billboard 360.2 352.2 674.1 658.3
Revenues 461.0 444.9 850.9 823.1
Canada        
Disaggregation of Revenue [Line Items]        
Revenues 16.3 23.9 34.9 41.5
Transit and other        
Disaggregation of Revenue [Line Items]        
Transit and other 103.8 95.3 183.2 168.7
Transit and other | United States        
Disaggregation of Revenue [Line Items]        
Transit and other 100.7 90.8 176.4 161.1
Other Revenues        
Disaggregation of Revenue [Line Items]        
Transit and other 0.1 1.9 0.4 3.7
Other Revenues | United States        
Disaggregation of Revenue [Line Items]        
Transit and other $ 0.1 $ 1.9 $ 0.4 $ 3.7