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Common and Preferred Shares (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 15, 2021 | Sep. 15, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 23, 2019
Class of Stock [Line Items] |  |  |  |  |  |
Common share repurchases authorized (up to) (in shares) |  |  |  |  |  | 120,000,000
Common shares repurchased (in shares) |  |  | 46,000,000 | 7,000,000 | 40,000,000 |
Common shares remaining under share repurchase authorizations (in shares) |  |  | 56,000,000 |  |  |
Shares held as treasury shares (in shares) |  |  | 2,500,000 | 2,500,000 | 2,600,000 |
Cost basis of treasury stock |  |  | $ 271.0 | $ 279.0 | $ 292.0 |
Preferred shares, authorized (in shares) |  |  | 20,000,000 | 20,000,000 |  |
Preferred shares, par value (in dollars per share) |  |  | $ 1.667 | $ 1.667 |  |
Liquidation price per share (in dollars per share) |  |  | 1,000,000 |  |  |
Depositary shares redemption amount |  |  | $ 1,000 |  |  |
Equity adjustments in connection with redemption of Preferred Shares |  |  | $ 16.0 | $ 0.0 | $ 0.0 |
Warrants, issued and outstanding (in shares) |  |  | 0 | 0 | 0 |
Repurchase Agreements |  |  |  |  |  |
Share Repurchase Commissions [Line Items] |  |  |  |  |  |
Cost basis of common stock repurchased |  |  | $ 7,600.0 | $ 900.0 | $ 4,600.0 |
Commissions paid included in cost basis of common stock repurchased |  |  | $ 5.6 | $ 1.0 | $ 6.2 |
Series D Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred shares, par value (in dollars per share) |  |  | $ 1.667 |  |  |
Fixed dividend rate per annum (as a percent) |  |  | 3.55% |  |  |
Series C Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Payments for redemption of preferred stock |  | $ 850.0 |  |  |  |
Fixed dividend rate per annum (as a percent) |  | 4.90% |  |  |  |
Series B Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Payments for redemption of preferred stock | $ 750.0 |  |  |  |  |
Fixed dividend rate per annum (as a percent) | 5.20% |  |  |  |  |

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