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Equity - Preferred Stock (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2019 | Nov. 06, 2018
Class of Stock [Line Items] |  |  |  |
Issuance of preferred shares | 13,800,000 |  | 13,800,000 |
Preferred Stock, Liquidation Preference, Value | $ 345,000,000 |  | $ 345,000,000 |
Preferred Stock, Redemption Date | Nov. 15, 2023 |  |  |
Preferred Stock, end of period |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of preferred shares |  |  |  | 13,800,000
Preferred Stock, Liquidation Preference, Value |  |  |  | $ 25,000
Share Price |  |  |  | $ 25.00
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Excluding Option Exercised |  | $ 334,000,000 |  |
Other Restrictions on Payment of Dividends | no |  |  |
Preferred Stock, Redemption Price Per Share | $ 25,000 |  |  |
Preferred Stock, Redemption Terms | 90 |  |  |
Preferred Stock, end of period | Rating Agency Event [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Redemption Price Per Share | $ 25,500 |  |  |
Preferred Stock, end of period | Regulatory Capital Event [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred Stock, Redemption Price Per Share | $ 25,000 |  |  |

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