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Preferred and Common Stockholders' Equity - Narrative (Details) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2016
Class of Stock [Line Items] |  |  |  |  |
Preferred stock authorized (shares) | 5,000,000.0 |  |  |  |
Preferred stock, par value (dollars per share) | $ 0.01 |  |  |  |
Preferred stock outstanding (shares) | 0 |  |  |  |
Common stock authorized (shares) | 150,000,000.0 |  |  |  |
Common stock, par value (dollars per share) | $ 0.01 |  |  |  |
Common stock issued (shares) | 77,700,000 | 74,700,000 | 75,400,000 | 74,500,000 |
Common stock outstanding (shares) | 77,700,000 | 74,700,000 | 75,400,000 | 74,500,000 |
Share repurchase program, remaining repurchase authorization | $ 110,700,000 |  |  |  |
Shares repurchased | 0 | 0 |  |  |
Eighth Share Repurchase Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  | $ 200,000,000.0

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