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Shareholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Dec. 31, 2020 USD ($) director period $ / shares shares | Sep. 30, 2020 $ / shares | Sep. 15, 2020 $ / shares | Jun. 30, 2020 $ / shares | Jun. 15, 2020 $ / shares | Jun. 05, 2020 USD ($) $ / shares shares | Mar. 31, 2020 $ / shares | Mar. 13, 2020 $ / shares | Mar. 22, 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, 2020 USD ($) director period $ / shares shares | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) director period $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) shares | Mar. 26, 2020 USD ($) | 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 |  |  |  |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 241,448,000 |  |
Par value (in usd per share) | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  | $ 1.00 |  |  |  | $ 1.00 | $ 1.00 |  |  |
Shares issued (in shares) | shares | 11,010,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,010,000 |  |  |  | 16,010,000 |  |  |  | 11,010,000 | 16,010,000 |  |  |
Dividends on preference shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,289,000 | $ 7,289,000 | $ 7,289,000 | $ 9,056,000 | $ 9,189,000 | $ 9,189,000 | $ 9,189,000 | $ 9,189,000 | $ 30,923,000 | $ 36,756,000 | 30,088,000 |  |
Dividends on common shares (Note 12) | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (68,500,000) | $ (59,400,000) | $ (52,800,000) |  |
Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,777,000 | 1,739,000 | 1,947,000 |  |
Share repurchase program, shares repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 406,000 | 0 | 0 |  |
Repurchase of shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 406,000 | $ 0 | $ 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of equity | $ |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in usd per share) |  |  | $ 0.35 |  | $ 0.35 |  |  | $ 0.35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid per common share (in usd per share) | $ 0.35 | $ 0.35 |  | $ 0.35 |  |  | $ 0.35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized aggregate amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Share repurchase program, shares repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 405,682 |  |  |  |
Repurchase of shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 62,600,000 |  |  |  |
Share repurchase program, price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 154.36 |  |  |  |
Share repurchase program, remaining authorized amount | $ | $ 437,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 437,400,000 |  |  |  |  |  |  |  | $ 437,400,000 |  |  |  |
Common shares | Underwritten Follow-On Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  |  |  |  | 6,325,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in usd per share) |  |  |  |  |  | $ 166.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares | Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  |  |  |  | 451,807 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of equity | $ |  |  |  |  |  | $ 75,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000.0 |
Proceeds from issuance of convertible preferred stock | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.08% |  |  |  |
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 |  |  |  |
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 |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
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 |  |  |  |
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  | $ 25,000 |  |  |  |
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 |  |  |  |
Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage interest in underlying shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  |
Redemption price per share (in usd per share) | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  | 25 |  |  |  |
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 |  |  |  |
TMR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  |  |  |  |  | 1,739,071 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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- Definition The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=120391452&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 11 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21564-112644 + Details
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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=120391452&loc=d3e13212-122682 + Details
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