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Shareholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Dec. 29, 2017 $ / shares | Dec. 15, 2017 $ / shares | Sep. 29, 2017 $ / shares | Sep. 15, 2017 $ / shares | Jun. 30, 2017 $ / shares | Jun. 15, 2017 $ / shares | Mar. 31, 2017 $ / shares | Mar. 15, 2017 $ / shares | Jun. 27, 2013 USD ($) shares | May 31, 2013 USD ($) $ / shares shares | Mar. 31, 2004 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) director period $ / shares shares | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) director period $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Nov. 10, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate authorized shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 325,000,000 |  |  |  |  |  |  |  | 325,000,000 |  |  |
Authorized common shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 225,000,000 |  |  |  |  |  |  |  | 225,000,000 |  |  |
Authorized preference shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  | 100,000,000 |  |  |
Dividends declared per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.28 | $ 1.24 | $ 1.2 |
Dividends on preference shares | $ |  |  |  |  |  |  |  |  |  |  |  | $ 5,595,000 | $ 5,595,000 | $ 5,596,000 | $ 5,595,000 | $ 5,595,000 | $ 5,595,000 | $ 5,596,000 | $ 5,595,000 | $ 22,381,000 | $ 22,381,000 | $ 22,381,000 |
Preference shares, par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  |  |  | $ 1 |  |  |  | $ 1 | $ 1 |  |
Preference shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 16,000,000 |  |  |  | 16,000,000 |  |  |  | 16,000,000 | 16,000,000 |  |
Preference shares, amount of preferred dividends in arrears, equivalent number of periods, trigger | period |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  | 6 |  |  |
Preference shares, preferred stock dividends in arrears, triggered shareholder election right, number of directors | director |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  | 2 |  |  |
Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  | $ 0.32 |  | $ 0.32 |  | $ 0.32 |  | $ 0.32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share (in usd per share) | $ 0.32 |  | $ 0.32 |  | $ 0.32 |  | $ 0.32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized aggregate amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Repurchase of shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |  |  |
Common shares repurchased during period, aggregate value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 188,600,000 |  |  |
Common shares repurchased during period, average cost per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (142.67) |  |  |
Remaining authorized shares per share repurchase program (in shares) | $ |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  | $ 500,000,000 |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.08% |  |  |
Liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1.52 |  |  |  |  |  |  |  | $ 1.52 |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | 0.38 |  |  |  |  |  |  |  | $ 0.38 |  |  |
Preference shares, issued (in shares) | $ |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, par value (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares redeemed (in shares) | shares |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, redemption amount | $ |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.375% |  |  |
Liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | 1.34375 |  |  |  |  |  |  |  | $ 1.34375 |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | 0.3359375 |  |  |  |  |  |  |  | 0.3359375 |  |  |
Preference shares, issued (in shares) | $ |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, par value (in usd per share) |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  | $ 25 |  |  |
Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,322,000 | 2,741,000 | 2,473,000 |
Common shares repurchased during period, aggregate value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,322,000 | $ 2,741,000 | $ 2,473,000 |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 7,435,000 |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on common shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (51,370,000) | $ (51,583,000) | $ (53,967,000) |
Dividends on preference shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,381,000 | $ 22,381,000 | $ 22,381,000 |

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