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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Common Stock, Shares Authorized | 600,000,000 | 600,000,000
Common Stock, Shares, Outstanding | 382,694,308 | 382,135,680
Preferred Stock, Shares Authorized | 20,000,000 | 20,000,000
Preferred Stock, Shares Outstanding | 440,000 | 440,000
Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01
At The Market Program |  |
ATM Program Equity Remaining Available for Issuance | $ 200.7 |
Forward Agreement |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ 500.0 |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value | $ 434.4 |
Series A Preferred Stock |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ 16.63 |
Preferred Stock, Amount of Preferred Dividends in Arrears | $ 6.7 |
Preferred Stock, Shares Outstanding | 400,000 |
Series B Preferred Stock |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears |  | $ 72.23
Preferred Stock, Amount of Preferred Dividends in Arrears |  | $ 1.4
Preferred Stock, Shares Outstanding | 20,000 |
Series B-1 Preferred Stock |  |
Preferred Stock, Shares Outstanding | 20,000 |

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