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Related Party Transactions - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
joint_venture
Displays
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
joint_venture
Displays
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Related Party Transaction [Line Items]          
Equity method investment, ownership percentage 50.00%   50.00%    
Equity method investments $ 24.9   $ 24.9   $ 27.0
Management fee revenue 2.0 $ 1.8 5.3 $ 4.8  
Revenues $ 386.7 336.5 $ 1,115.3 958.8  
CBS Corp.          
Related Party Transaction [Line Items]          
Selling, general and administrative expenses from transactions with related party   0.3   9.5  
Revenues   7.5   14.5  
Revenue from related parties   0.7   7.7  
Accounts receivable, related parties, current         0.0
Accounts payable, related parties, current         $ 0.2
Other related parties          
Related Party Transaction [Line Items]          
Revenues   2.4   6.0  
Revenue from related parties   $ 0.7   $ 4.3  
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 4   4    
Equity method investment, number of displays | Displays 13   13