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Redeemable Preferred Stock - Additional Information (Details) |  | 12 Months Ended
--- | --- | ---
Aug. 31, 2017 USD ($) trading_day $ / shares shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares
Temporary Equity [Line Items] |  |  |
Preferred stock, par value (in USD per share) | $ / shares |  | $ 0.01 | $ 0.01
Dividends declared but unpaid | $ |  | $ 0 | $ 0
Cumulative preferred dividends | $ |  | $ 109,000,000.0 | $ 69,500,000
Cumulative preferred dividends (in USD per share) | $ / shares |  | $ 351.54 | $ 224.09
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |
Balance at beginning of period | $ |  | $ 395,000,000.0 | $ 359,300,000
Dividends accrued (there were no cash dividends declared) | $ |  | 39,500,000 | 35,700,000
Cash dividends declared | $ |  | 0 | 0
Balance at end of period | $ |  | $ 434,500,000 | $ 395,000,000.0
Series A Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Preferred stock dividend rate | 10.00% |  |
Trading days | trading_day | 20 |  |
Consecutive trading days | trading_day | 30 |  |
Threshold share price (in USD per share) | $ / shares | $ 42.00 |  |
Maximum cash dividend declarable | 50.00% |  |
Redemption price (in USD per share) | $ / shares | $ 1,000.00 |  |
Series A Preferred Stock | Common Stock |  |  |
Temporary Equity [Line Items] |  |  |
Share price (in USD per share) | $ / shares | $ 19.00 |  |
Majority Shareholder | Series A Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Stock issued during period (shares) | shares | 310,000 |  |
Preferred stock, par value (in USD per share) | $ / shares | $ 0.01 |  |
Purchase price per share (in USD per share) | $ / shares | $ 1,000 |  |
Initial public offering | $ | $ 310,000,000.0 |  |

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