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Commitment and Contingencies - Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 01, 2020 USD ($) | Jun. 30, 2020 USD ($) Displays | Jun. 30, 2020 USD ($) Displays | Dec. 31, 2020 | Dec. 31, 2019 USD ($)
Subsequent event |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Equipment Deployment Costs Percentage | 30.00% |  |  |  |
Standalone letters of credit and sublimit to revolving credit facility |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Letters of credit outstanding, amount | $ |  | $ 72.6 | $ 72.6 |  |
Surety Bond |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Surety bonds outstanding | $ |  | $ 161.5 | 161.5 |  |
MTA Agreement | Subsequent event |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Revenue share percentage |  |  |  | 65.00% |
MTA equipment deployment costs |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Deployment costs incurred | $ |  |  | $ 28.3 |  | $ 124.2
Metropolitan Transportation Authority ("MTA") | Subsequent event |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Equipment Deployment Costs Percentage | 70.00% |  |  |  |
Maximum | MTA equipment deployment costs | Subsequent event |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Deployment costs incurred | $ | $ 143.0 |  |  |  |
MTA digital advertising screens on subway and train platforms |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Number of displays |  | 8,565 | 8,565 |  |
MTA smaller-format digital advertising screens rolling stock |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Number of displays |  | 37,716 | 37,716 |  |
MTA communication displays |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Number of displays |  | 7,829 | 7,829 |  |
MTA displays installed |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Number of displays |  | 5,350 | 5,350 |  |
Number of display additions |  | 97 | 773 |  |

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