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Commitment and Contingencies - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) Displays | Jun. 30, 2019 USD ($) Displays | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Other Commitments [Line Items] |  |  |  |
MTA equipment development cost additions | $ |  | $ 71.1 |  | $ 91.2
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 | 2,768 | 2,768 |  |
Number of display additions | 804 | 1,539 |  |
Standalone letters of credit and sublimit to revolving credit facility [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Letters of credit outstanding, amount | $ | $ 209.0 | $ 209.0 |  |
Surety Bond |  |  |  |
Other Commitments [Line Items] |  |  |  |
Surety bonds outstanding | $ | $ 26.6 | $ 26.6 |  |
Subsequent Event |  |  |  |
Other Commitments [Line Items] |  |  |  |
MTA equipment development cost additions | $ |  |  | $ 150.0 |

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