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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 11, 2018 | Sep. 01, 2021 | Dec. 31, 2018 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 15, 2023 | Apr. 19, 2021 | Feb. 22, 2021 | Aug. 01, 2019 | Dec. 05, 2018 | Nov. 01, 2018
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Aggregate Sale Price |  |  |  |  |  |  |  |  | $ 750.0 | $ 434.4 |  | $ 500.0
Preferred Stock, Par or Stated Value Per Share |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |
Net Process from Sale |  |  |  |  |  |  |  | $ 835.5 |  |  |  |
Equity Units Stock Purchase Contract Liability Payment |  |  |  | $ 66.8 | $ 41.2 |  |  |  |  |  |  |
Purchase Contract Liability |  |  |  | $ 65.0 | $ 129.4 | $ 0.0 |  | $ 168.8 |  |  |  |
Equity Units purchase contracts |  |  |  | 30,200,000 | 22,000,000.0 | 0 |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit purchase contract payment balance |  |  |  | 2,500,000 |  |  |  |  |  |  |  |
Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  |  |  |  |  |  |  | $ 100 |  |  |  |
Corporate Units Contract Annual Rate |  |  |  |  |  |  |  | 7.75% |  |  |  |
Shares To Be Issued Under Stock Purchase Contracts |  |  |  | 35,200,000 |  |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares To Be Issued Under Stock Purchase Contracts |  |  |  | 35,200,000 |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 5.65% |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Initial Margin | 2.843% |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Initial Margin Plus 1.000% | 1.00% |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Amount of Preferred Dividends in Arrears |  |  |  | $ 1.0 |  |  |  |  |  |  |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears |  |  |  | $ 2.51 |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  |  | $ 400.0 | $ 400.0 | $ 400.0 |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 6.50% |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  | $ 25,000 |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Initial Margin |  |  | 3.632% |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Initial Margin Plus 1.000% |  |  | 1.00% |  |  |  |  |  |  |  |  |
Preferred Stock, Amount of Preferred Dividends in Arrears |  |  |  | $ 1.4 |  |  |  |  |  |  |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears |  |  |  | $ 72.23 |  |  |  |  |  |  |  |
Preferred Stock Depositary Shares Issued |  |  |  |  |  |  |  |  |  |  | 20,000,000 |
Preferred Stock, Liquidation Preference, Value |  |  |  | $ 500.0 | $ 500.0 | $ 500.0 |  |  |  |  |  |
Depositary Stock Liquidation Preference |  |  |  | $ 25 |  |  |  |  |  |  |  |
Series B-1 Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  | 20,000 |  |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  |  | $ 863.0 |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  | $ 0.01 |  |  |  |
Undivided Beneficial Ownership Interest, Percent |  |  |  |  |  |  |  | 10.00% |  |  |  |
Gross Proceeds | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 400.0 |  |  |  |  |  |  |  |  |  |  |
Gross Proceeds | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  | $ 500.0 |  |  |  |  |  |  |  |  |
Forward August 2021 |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  | 5,941,598 |  |  |  |  |  |  |  |  |  |
Derivative, Forward Price |  | $ 25.25 |  | $ 23.90 |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value |  |  |  | $ 142.0 |  |  |  |  |  |  |  |
Preferred Stock | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 393.9 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | Net Proceeds | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  | $ 486.1 |  |  |  |  |  |  |  |  |
At The Market Program |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ATM Program Equity Remaining Available for Issuance |  |  |  | $ 300.0 |  |  |  |  |  |  |  |
Subsequent Event | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  |  |  | $ 1,000 |  |  |  |  |

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