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Investment Agreement, Number Of Shares Issued In Transaction

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Preferred Stock, Liquidation Preference Per Share, Per Annum

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Preferred Stock, Liquidation Preference Per Share, Quarterly

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Preferred Stock, Percentage Interest In Underlying Shares

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Preferred Stock, Right To Elect Directors, Number Of Directors

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Preferred Stock, Right To Elect Directors, Required Number Of Dividend Periods In Arrears

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The maximum number of common shares and 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.

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Number of shares of equity interests issued or issuable to acquire entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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The percentage rate used to calculate dividend payments on preferred stock.

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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.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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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.

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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.

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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.

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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.

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The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock.

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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.

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Number of new stock issued during the period.

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Number of stock bought back by the entity at the exercise price or redemption price.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Shareholders' Equity (Narrative) (Details)													1 Months Ended			3 Months Ended								12 Months Ended
Shareholders' Equity (Narrative) (Details)	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