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Revenues Revenue from External Customers by Geographic Areas (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Billboard $ 305.8 $ 280.4 $ 556.8 $ 519.7
Transit and other 154.1 121.3 274.8 219.9
Revenues 459.9 401.7 831.6 739.6
United States        
Disaggregation of Revenue [Line Items]        
Billboard 285.1 262.5 521.3 488.8
Revenues 435.3 380.2 790.0 702.9
Canada        
Disaggregation of Revenue [Line Items]        
Revenues 24.6 21.5 41.6 36.7
Transit and other        
Disaggregation of Revenue [Line Items]        
Transit and other 138.4 108.3 242.8 194.1
Transit and other | United States        
Disaggregation of Revenue [Line Items]        
Transit and other 134.5 104.7 236.7 188.3
Sports marketing and other        
Disaggregation of Revenue [Line Items]        
Transit and other 15.7 13.0 32.0 25.8
Sports marketing and other | United States        
Disaggregation of Revenue [Line Items]        
Transit and other $ 15.7 $ 13.0 $ 32.0 $ 25.8