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Shareholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Sep. 30, 2021 $ / shares | Sep. 15, 2021 $ / shares | Jul. 12, 2021 USD ($) shares | Jun. 30, 2021 $ / shares | Jun. 15, 2021 $ / shares | Mar. 31, 2021 $ / shares | Mar. 15, 2021 $ / shares | Dec. 31, 2020 $ / 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 | Jun. 27, 2013 USD ($) shares | Jun. 30, 2018 USD ($) $ / shares shares | May 31, 2013 $ / shares shares | Mar. 31, 2004 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) period director $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) shares | Aug. 11, 2021 USD ($) | Jul. 31, 2021 $ / shares | Jul. 28, 2021 USD ($) | Mar. 26, 2020 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate authorized shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 325,000,000 |  |  |  |  |  |
Authorized common shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000,000 |  |  |  |  |  |
Authorized preference shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 | $ 1.00 |  |  |  |  |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 488,653,000 | $ 0 | $ 0 |  |  |  |
Preference shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  | 11,010,000 |  |  |  |  |  |  |  |  |  |  |  |  | 30,000 | 11,010,000 |  |  |  |  |
Dividends paid per common share (in usd per share) | $ 0.36 |  |  | $ 0.36 |  | $ 0.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on preference shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,266,000 | $ 30,923,000 | 36,756,000 |  |  |  |
Dividends on common shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 67,800,000 | $ 68,500,000 | $ 59,400,000 |  |  |  |
Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 6,777,000 | 1,739,000 |  |  |  |
Share repurchase program, shares repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,579,000 | 406,000 | 0 |  |  |  |
Repurchase of shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,579,000 | $ 406,000 | $ 0 |  |  |  |
TMR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,739,071 |  |  |  |  |  |  |  |  |  |  |
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) |  | $ 0.36 |  |  | $ 0.36 |  | $ 0.36 |  |  | $ 0.36 |  | $ 0.36 |  |  | $ 0.36 |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid per common share (in usd per share) |  |  |  |  |  |  |  | $ 0.36 | $ 0.36 |  | $ 0.36 |  |  | $ 0.36 |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized aggregate amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Share repurchase program, shares repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,578,133 |  |  |  |  |  |
Repurchase of shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |
Share repurchase program, price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 156.78 |  |  |  |  |  |
Share repurchase program, remaining authorized amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 306,600,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |
Proceeds from issuance of equity | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |
Liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,437.5 |  |  |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 359.375 |  |  |  |  |  |
Series F Preferred Stock | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |
Series G Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  | 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of equity | $ |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.20% |  |  |  |  |  |
Liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,050 |  |  |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 262.50 |  |  |  |  |  |
Series G Preferred Stock | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |
Depositary Shares, each representing a 1/1,000th interest in a Series F 5.750% Preference Share, Par Value $1.00 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Shares, each representing a 1/1,000th interest in a Series G 4.20% Preference Share, Par Value $1.00 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage interest in underlying shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |  | 0.10% |  |
Depositary Shares | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.08% |  |  |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |
Preference shares, shares redeemed (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |
Preference shares, redemption amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  | $ 125,000,000
Preference shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Right to elect directors, required number of dividend periods in arrears | period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |
Right to elect directors, number of directors | director |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.52 |  |  |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.38 |  |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.375% |  |  |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |
Preference shares, redemption amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  |  |
Preference shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.34375 |  |  |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3359375 |  |  |  |  |  |
Series F Preferred Shares, Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.4375 |  |  |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.359375 |  |  |  |  |  |
Series G Preferred Shares, Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.05 |  |  |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.2625 |  |  |  |  |  |

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