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Revenues Revenue from External Customers by Geographic Areas (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Billboard $ 312.0 $ 290.6 $ 868.8 $ 810.3
Transit and other 150.5 123.6 425.3 343.5
Revenues 462.5 414.2 1,294.1 1,153.8
United States        
Disaggregation of Revenue [Line Items]        
Billboard 292.8 271.3 814.1 760.1
Revenues 439.9 391.5 1,229.9 1,094.4
Canada        
Disaggregation of Revenue [Line Items]        
Revenues 22.6 22.7 64.2 59.4
Transit and other        
Disaggregation of Revenue [Line Items]        
Transit and other 133.3 111.8 376.1 305.9
Transit and other | United States        
Disaggregation of Revenue [Line Items]        
Transit and other 129.9 108.4 366.6 296.7
Sports marketing and other        
Disaggregation of Revenue [Line Items]        
Transit and other 17.2 11.8 49.2 37.6
Sports marketing and other | United States        
Disaggregation of Revenue [Line Items]        
Transit and other $ 17.2 $ 11.8 $ 49.2 $ 37.6