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Shareholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2019 USD ($) director period $ / shares shares | Dec. 13, 2019 $ / shares | Sep. 30, 2019 $ / shares | Sep. 13, 2019 $ / shares | Jun. 28, 2019 $ / shares | Jun. 14, 2019 $ / shares | Mar. 29, 2019 $ / shares | Mar. 22, 2019 shares | Mar. 15, 2019 $ / shares | Dec. 20, 2018 shares | Oct. 30, 2018 USD ($) | Jun. 27, 2013 USD ($) shares | Jun. 30, 2018 USD ($) $ / shares shares | May 31, 2013 USD ($) $ / shares shares | Mar. 31, 2004 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) director period $ / shares shares | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) director period $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares | Nov. 10, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate authorized shares (in shares) | shares | 325,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 325,000,000 |  |  |  |  |  |  |  | 325,000,000 |  |  |
Authorized common shares (in shares) | shares | 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000,000 |  |  |  |  |  |  |  | 225,000,000 |  |  |
Authorized preference shares (in shares) | shares | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  | 100,000,000 |  |  |
Dividends on preference shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,189,000 | $ 9,189,000 | $ 9,189,000 | $ 9,189,000 | $ 9,189,000 | $ 9,708,000 | $ 5,596,000 | $ 5,595,000 | $ 36,756,000 | $ 30,088,000 | $ 22,381,000 |
Dividends on common shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (59,400,000) | (52,800,000) | (51,400,000) |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 241,448,000 | $ 0 |
Par value (in usd per share) | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  |  |  | $ 1 |  |  |  | $ 1 | $ 1 |  |
Preference shares, shares outstanding (in shares) | shares | 16,010,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,010,000 |  |  |  | 16,010,000 |  |  |  | 16,010,000 | 16,010,000 |  |
Shares issued (in shares) | shares | 16,010,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,010,000 |  |  |  | 16,010,000 |  |  |  | 16,010,000 | 16,010,000 |  |
Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,739,000 | 1,947,000 | 0 |
Common shares | Private Placement | State Farm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Agreement, shares issued in transaction (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,947,496 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Agreement, consideration received per transaction | $ |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in usd per share) |  | $ 0.34 |  | $ 0.34 |  | $ 0.34 |  |  | $ 0.34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid per common share (in usd per share) | $ 0.34 |  | $ 0.34 |  | $ 0.34 |  | $ 0.34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized aggregate amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Share repurchase program, remaining authorized shares (in shares) | $ | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |  |  |  |  |  |  |  | $ 500,000,000.0 |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.08% |  |  |
Liquidation preference per annum (in usd per share) | $ 1.52 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.52 |  |  |  |  |  |  |  | $ 1.52 |  |  |
Quarterly liquidation preference (in usd per share) | $ 0.38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.38 |  |  |  |  |  |  |  | $ 0.38 |  |  |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares redeemed (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, redemption amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to elect directors, required number of dividend periods in arrears | period | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  | 6 |  |  |
Right to elect directors, number of directors | director | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  | 2 |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.375% |  |  |
Liquidation preference per annum (in usd per share) | $ 1.34375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.34375 |  |  |  |  |  |  |  | $ 1.34375 |  |  |
Quarterly liquidation preference (in usd per share) | 0.3359375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3359375 |  |  |  |  |  |  |  | 0.3359375 |  |  |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  | $ 25 |  |  |
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |
Liquidation preference per annum (in usd per share) | 1,437.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,437.50 |  |  |  |  |  |  |  | $ 1,437.50 |  |  |
Quarterly liquidation preference (in usd per share) | 359.375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 359.375 |  |  |  |  |  |  |  | 359.375 |  |  |
Shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |
Liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |
Redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |
Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference per annum (in usd per share) | 1.4375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.4375 |  |  |  |  |  |  |  | 1.4375 |  |  |
Quarterly liquidation preference (in usd per share) | $ 0.359375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.359375 |  |  |  |  |  |  |  | $ 0.359375 |  |  |
Shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |
Percentage interest in underlying shares |  |  |  |  |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  |
Redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |
TMR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  |  |  |  | 1,739,071 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21564-112644 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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