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Revenues Revenue from External Customers (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from External Customer [Line Items]                      
Billboard                 $ 1,189.9 $ 1,112.4 $ 1,059.0
Transit and other                 592.3 493.8 461.5
Revenues $ 488.1 $ 462.5 $ 459.9 $ 371.7 $ 452.4 $ 414.2 $ 401.7 $ 337.9 1,782.2 1,606.2 1,520.5
United States                      
Revenue from External Customer [Line Items]                      
Billboard                 1,114.9 1,040.8 997.9
Revenues [1]                 1,694.4 1,521.6 1,447.3
Canada                      
Revenue from External Customer [Line Items]                      
Revenues                 87.8 84.6 73.2
Transit franchise contract                      
Revenue from External Customer [Line Items]                      
Transit and other                 526.6 439.0 420.7
Transit franchise contract | United States                      
Revenue from External Customer [Line Items]                      
Transit and other                 513.8 426.0 408.6
Sports marketing and other                      
Revenue from External Customer [Line Items]                      
Transit and other                 65.7 54.8 40.8
Sports marketing and other | United States                      
Revenue from External Customer [Line Items]                      
Transit and other                 $ 65.7 $ 54.8 $ 40.8
[1]
Revenues classifications are based on the geography of the advertising.