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Common and Preferred Shares (Details Textuals) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 23, 2019
Common And Preferred Shares And Warrants (Textuals) [Abstract] |  |  |  |
Common share repurchases authorized (up to) (in shares) |  |  |  | 120,000,000
Common shares repurchased (in shares) | 7,000,000 | 40,000,000 | 15,000,000 |
Common shares remaining under share repurchase authorizations (in shares) | 102,000,000 |  |  |
Shares held as treasury shares (in shares) | 2,500,000 | 2,600,000 | 2,700,000 |
Cost basis of treasury stock | $ 279.0 | $ 292.0 | $ 207.0 |
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 |  |  |
Warrants, issued and outstanding (in shares) | 0 | 0 | 0 |
Repurchase Agreements [Member] |  |  |  |
Share Repurchase Commissions [Line Items] |  |  |  |
Cost basis of common stock repurchased | $ 900.0 | $ 4,600.0 | $ 1,600.0 |
Commissions paid included in cost basis of common stock repurchased | $ 1.0 | $ 6.2 | $ 2.2 |

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