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Related Party Transactions - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
joint_venture
Displays
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
joint_venture
Displays
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Related Party Transaction [Line Items]          
Equity method investment, ownership percentage 50.00%   50.00%    
Equity method investments $ 23.6   $ 23.6   $ 27.0
Management fee revenue 1.8 $ 2.1 3.3 $ 3.0  
Revenues 384.7 334.4 728.6 622.3  
CBS Corp.          
Related Party Transaction [Line Items]          
Selling, general and administrative expenses from transactions with related party   2.8   9.2  
Revenues   5.1   7.0  
Accounts receivable, related parties, current 0.0   0.0   0.0
Accounts payable, related parties, current $ 0.0   $ 0.0   $ 0.2
Other related parties          
Related Party Transaction [Line Items]          
Revenues   $ 2.0   $ 3.6  
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 17   17