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Common and Preferred Shares and Warrants (Details Textuals) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 26, 2012
Component of Operating Other Cost and Expense [Line Items] |  |  |  |
Common shares repurchased | 69,000,000 | 48,000,000 |  |
Cost basis of common stock repurchased | $ 3,952.0 | $ 2,300.0 | $ 590.0 |
Common And Preferred Shares And Warrants (Textuals) [Abstract] |  |  |  |
Common share repurchases authorized |  |  |  | 150,000,000
Common shares remaining under share repurchase authorizations | 83,000,000 |  |  |
Shares held as treasury shares | 3,900,000 | 4,200,000 | 4,700,000 |
Cost basis of treasury stock | 236 | 217 | 219 |
Preferred shares, authorized | 20,000,000 |  |  |
Preferred shares, par value | 1.66 |  |  |
Preferred stock, shares issued | 0 | 0 | 0 |
Preferred stock, shares outstanding | 0 | 0 | 0 |
Commissions Paid [Member] |  |  |  |
Component of Operating Other Cost and Expense [Line Items] |  |  |  |
Cost basis of common stock repurchased | $ 1.0 | $ 1.0 |  |

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- Definition Represents the face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that is permitted to be authorized by the Board of Directors; generally not indicative of the fair market value per share. + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + 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://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 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 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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