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Related Party Transactions - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Displays
joint_venture
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Related Party Transaction [Line Items]      
Equity method investment, ownership percentage 50.00%    
Equity method investments | $ $ 11.3   $ 11.2
Management fee revenue | $ $ 1.7 $ 1.1  
Transit shelter joint ventures      
Related Party Transaction [Line Items]      
Equity method investment, number of investments | joint_venture 2    
Acquired businesses      
Related Party Transaction [Line Items]      
Equity method investment, number of investments | joint_venture 4    
Equity method investment, number of displays | Displays 7