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Related Party Transactions - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) joint_venture Displays | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) joint_venture Displays | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  | 50.00% |  |
Equity method investments | $ | $ 16.8 |  | $ 16.8 |  | $ 16.1
Management fee revenue | $ | $ 2.2 | $ 2.2 | $ 6.1 | $ 5.7 |
Transit shelter joint ventures |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity method investment, number of investments | joint_venture | 2 |  | 2 |  |
Acquired businesses |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity method investment, number of investments | joint_venture | 4 |  | 4 |  |
Equity method investment, number of displays | Displays | 11 |  | 11 |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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