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Related Party Transactions - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
joint_venture
Displays
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
joint_venture
Displays
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Related Party Transaction [Line Items]          
Equity method investment, ownership percentage 50.00%   50.00%    
Equity method investments | $ $ 23.4   $ 23.4   $ 21.3
Management fee revenue | $ $ 1.9 $ 2.0 $ 5.4 $ 5.3  
Transit shelter joint ventures          
Related Party Transaction [Line Items]          
Equity method investment, number of investments | joint_venture 2   2    
Acquired joint ventures          
Related Party Transaction [Line Items]          
Equity method investment, number of investments | joint_venture 3   3    
Equity method investment, number of displays | Displays 15   15