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v3.20.4

Equity (Terms of Outstanding Preferred Stock) (Details) |  | 4 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2016 shares | May 07, 2013 shares | Apr. 24, 2012 shares | Jul. 27, 2011 shares | Dec. 31, 2020 votingRightPerShare $ / shares
Series B Preferred Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Preferred stock, dividend rate (in dollars per share) | $ / shares |  |  |  |  | $ 1.80
Preferred stock, voting rights | votingRightPerShare |  |  |  |  | 8
Series O Preferred Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of Depositary Shares Issued and Outstanding |  |  |  | 1,000,000 |
Fractional Interest in a share of preferred stock represented by each Depositary Share |  |  |  | 1.00% |
Preferred stock, dividend rate, percentage |  |  |  | 6.75% |
Series P Preferred Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of Depositary Shares Issued and Outstanding |  |  | 60,000,000 |  |
Fractional Interest in a share of preferred stock represented by each Depositary Share |  |  | 0.025% |  |
Preferred stock, dividend rate, percentage |  |  | 6.125% |  |
Series R Preferred Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of Depositary Shares Issued and Outstanding |  | 500,000 |  |  |
Fractional Interest in a share of preferred stock represented by each Depositary Share |  | 1.00% |  |  |
Preferred stock, dividend rate, percentage |  | 4.85% |  |  |
Series S Preferred Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of Depositary Shares Issued and Outstanding | 525,000 |  |  |  |
Fractional Interest in a share of preferred stock represented by each Depositary Share | 1.00% |  |  |  |
Preferred stock, dividend rate, percentage | 5.00% |  |  |  |
3-month LIBOR | Series O Preferred Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate - LIBOR Plus |  |  |  | 3.678% |
3-month LIBOR | Series P Preferred Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate - LIBOR Plus |  |  | 4.0675% |  |
3-month LIBOR | Series R Preferred Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate - LIBOR Plus |  | 3.04% |  |  |
3-month LIBOR | Series S Preferred Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate - LIBOR Plus | 3.30% |  |  |  |

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