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Common and Preferred Shares (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 23, 2019
Class of Stock [Line Items] |  |  |  |
Common share repurchases authorized (up to) (in shares) |  |  |  | 120,000,000
Common shares repurchased (in shares) | 20,000,000 | 46,000,000 | 7,000,000 |
Cost basis of common stock repurchased | $ 3,502.0 | $ 7,652.0 | $ 1,029.0 |
Common shares remaining under share repurchase authorizations (in shares) | 36,000,000 |  |  |
Shares held as treasury shares (in shares) | 2,400,000 | 2,500,000 | 2,500,000 |
Cost basis of treasury stock | $ 262.0 | $ 271.0 | $ 279.0 |
Preferred shares, authorized, up to (in shares) | 20,000,000 | 20,000,000 |  |
Preferred shares, par value (in dollars per share) | $ 1.667 | $ 1.667 |  |
Redemption price per preferred share (in dollars per share) | 1,000,000 |  |  |
Depositary shares redemption amount | $ 1,000 |  |  |
Equity adjustments in connection with redemption of Preferred Shares | $ 0.0 | $ 16.0 | $ 0.0 |
Warrants, issued and outstanding (in shares) | 0 | 0 | 0 |
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred shares, par value (in dollars per share) | $ 1.667 |  |  |
Series B And Series C Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Payments for redemption of preferred stock |  | $ 1,600.0 |  |
Equity adjustments in connection with redemption of Preferred Shares |  | 16.0 |  |
Repurchase Agreements |  |  |  |
Class of Stock [Line Items] |  |  |  |
Cost basis of common stock repurchased | $ 3,300.0 | 7,600.0 | $ 900.0 |
Commissions paid included in cost basis of common stock repurchased | $ 4.2 | $ 5.6 | $ 1.0 |

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- Definition The amount of cash paid for commissions during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3536-108585 + Details
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