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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 |  |

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