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Income Taxes - Textual (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020
U.S. federal | Earliest Tax Year |  |
Operating Loss Carryforwards [Line Items] |  |
Open tax year | 2017 |
State | Earliest Tax Year |  |
Operating Loss Carryforwards [Line Items] |  |
Open tax year | 2017 |
Metropolitan |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating losses |  | $ 62.1

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