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Summary of Significant Accounting Policies Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2020
Accounting Policies [Line Items] |  |  |  |
Deferred revenue | $ 0.8 | $ 2.7 |  |
Advertising and marketing expense | 7.4 | 9.7 | $ 8.9 |
Capitalized interest | $ 0.0 | $ 1.4 | $ 1.6 |
Number of reportable segments | segment | 2 |  |  |
Observatory Reporting Unit |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Fair value in excess of carrying value (less than) (as a percent) |  |  |  | 5.00%
Building and Building Improvements |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 39 years |  |  |
Corporate Equipment | Minimum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 3 years |  |  |
Corporate Equipment | Maximum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 7 years |  |  |

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