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Shareholders' Equity (Details) (USD $) | 0 Months Ended | 3 Months Ended |  | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended |
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Mar. 14, 2014 | Mar. 31, 2014 director period | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Retained Earnings | Mar. 31, 2013 Retained Earnings | Mar. 14, 2014 Common Shares | Nov. 14, 2013 Common Shares | Mar. 31, 2014 Common Shares | Jun. 27, 2013 Series C Preferred Stock | Mar. 31, 2004 Series C Preferred Stock | Mar. 31, 2014 Series C Preferred Stock | Jun. 27, 2013 Series D Preferred Stock | Dec. 27, 2012 Series D Preferred Stock | Dec. 31, 2006 Series D Preferred Stock | May 31, 2013 Series E Preferred Stock | Mar. 31, 2014 Series E Preferred Stock
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared, Per common share (usd per share) |  | $ 0.29 | $ 0.28 |  |  |  | $ 0.29 |  |  |  |  |  |  |  |  |  |
Dividends paid, Per common share (usd per share) | $ 0.29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid, Preference shares |  | $ 5,595,000 | $ 6,275,000 |  | $ 5,595,000 | $ 6,275,000 |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid, Common shares |  |  |  |  | 11,899,000 | 12,329,000 |  |  |  |  |  |  |  |  |  |  |
Repurchase of shares |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |
Repurchase of shares |  |  |  |  | 278,252,000 | 109,501,000 |  |  | 277,100,000 |  |  |  |  |  |  |  |
Common shares repurchased during period, Average cost per share |  |  |  |  |  |  |  |  | $ 93.04 |  |  |  |  |  |  |  |
Share repurchase program, Authorized aggregate amount |  |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |
Share repurchase program, Remaining authorized aggregate amount |  |  |  |  |  |  |  |  | 408,710,000 |  |  |  |  |  |  |  |
Proceeds from issuance of preference shares |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  | 300,000,000 | 275,000,000 |
Preference shares issued, Shares |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  | 12,000,000 | 11,000,000 |
Preferred Stock, No Par Value |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  | $ 25 | $ 25 |
Stock Redeemed or Called During Period, Shares |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  | 6,000,000 | 6,000,000 |  |  |
Redemption price per share, on or after March 23, 2009 |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  | $ 25
Preference shares, Dividend rate |  |  |  |  |  |  |  |  |  |  |  | 6.08% |  |  |  | 5.375% |
Preferred shares, Redemption amount, shares |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |
Preferred shares, Amount of preferred dividends in arrears, equivalent number of periods, trigger |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, Preferred stock dividends in arrears, triggered shareholder election right, number of directors |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, Redemption amount |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  | $ 150,000,000 | $ 150,000,000 |  |  |
Preferred shares, Shares outstanding |  | 16,000,000 |  | 16,000,000 |  |  |  |  |  | 5,000,000 |  |  | 0 | 6,000,000 |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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