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Capital Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified | Dec. 31, 2012 | May 31, 2012 | May 30, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Incentive Plans |  |  |  |
Common stock, Authorized shares | 480,000,000 | 480,000,000 | 240,000,000 | 240,000,000
Treasury stock |  |  |  |
Cumulative number of shares repurchased under a share repurchase program | 10,409,400 |  |  |
Treasury stock, number of shares authorized to be repurchased | 20,000,000 |  |  |
Cumulative cost of shares repurchased under a share repurchase program | $ 85.7 |  |  |
Treasury stock, cumulative shares retired | 10,005,000 |  |  |
Shares held as treasury stock | 404,400 |  |  | 404,400
2004 Incentive Plan |  |  |  |
Incentive Plans |  |  |  |
Number of shares reserved for issuance | 10,200,000 |  |  |
2004 Incentive Plan | Stock awards not subject to the achievement of performance based goals | Less than or equal to |  |  |  |
Incentive Plans |  |  |  |
Number of shares reserved for issuance | 3,600,000 |  |  |
2004 Incentive Plan | Stock options | Less than or equal to |  |  |  |
Incentive Plans |  |  |  |
Number of shares reserved for issuance | 6,000,000 |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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