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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Apr. 19, 2021 | Dec. 31, 2020
Preferred Stock, Shares Authorized | 20,000,000 |  | 20,000,000 |  | 20,000,000
Preferred Stock, Shares Outstanding | 1,302,500 |  | 1,302,500 |  | 440,000
Preferred Stock, Par or Stated Value Per Share | $ 0.01 |  | $ 0.01 |  | $ 0.01
Series A Corporate Units |  |  |  |  |
Shares Issued, Price Per Share |  |  |  | $ 100 |
Shares To Be Issued Under Stock Purchase Contracts |  |  | 35,200,000 |  |
Series C Preferred Stock |  |  |  |  |
Shares To Be Issued Under Stock Purchase Contracts |  |  | 35,200,000 |  |
At The Market Program |  |  |  |  |
Common Stock Aggregate Sale Price |  |  | $ 750.0 |  |
ATM Program Equity Remaining Available for Issuance |  |  | 300.0 |  |
Forward February 21 Member |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares | 6,672,740 |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ 22.48 |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value | $ 145.0 |  | $ 145.0 |  |
Forward Contract Indexed to Issuers Equity, Forward Rate Per Share, at Fair Value |  |  | $ 21.73 |  |
Forward June 21 Member |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares | 5,852,475 |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ 25.63 |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value | $ 146.9 |  | $ 146.9 |  |
Forward Contract Indexed to Issuers Equity, Forward Rate Per Share, at Fair Value |  |  | $ 25.10 |  |
Forward August 21 Member |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares | 5,941,598 |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ 25.25 |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value | $ 148.4 |  | $ 148.4 |  |
Forward Contract Indexed to Issuers Equity, Forward Rate Per Share, at Fair Value |  |  | $ 24.97 |  |
Series A Preferred Stock |  |  |  |  |
Preferred Stock, Shares Outstanding | 400,000 |  | 400,000 |  |
Preferred Stock, Amount of Preferred Dividends in Arrears | $ 6.7 | $ 6.7 |  |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ 16.63 | $ 16.63 |  |  |
Series B Preferred Stock |  |  |  |  |
Preferred Stock, Shares Outstanding | 20,000 |  | 20,000 |  |
Preferred Stock, Amount of Preferred Dividends in Arrears | $ 1.4 | $ 1.4 |  |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ 72.23 | $ 72.23 |  |  |
Series B-1 Preferred Stock |  |  |  |  |
Preferred Stock, Shares Outstanding | 20,000 |  | 20,000 |  |
Series C Preferred Stock |  |  |  |  |
Preferred Stock, Shares Outstanding | 862,500 |  | 862,500 |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  | $ 0.01 |
Undivided Beneficial Ownership Interest, Percent |  |  |  | 10.00% |

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