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Stock-Based Compensation Outstanding Options and SSARs (Details) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended
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Sep. 30, 2013 years | Dec. 31, 2012 | Sep. 30, 2013 Director [Member] | Sep. 30, 2013 Employee Stock Option [Member] Director [Member] | Sep. 30, 2013 Options and SSARs [Member] | Sep. 30, 2013 Options and SSARs [Member] | Sep. 30, 2013 Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |
Options / SSARs outstanding at January 1, 2012 | 8,475,000 |  |  |  |  |  |
Incentive shares granted | 343,000 |  |  |  |  |  |
Options / SSARs exercised | (1,854,000) |  |  |  |  |  |
Options / SSARs cancelled | 0 |  |  |  |  |  |
Options / SSARs outstanding at September 30, 2012 | 6,964,000 |  |  |  |  |  |
Options / SSARs outstanding Weighted Average Exercise Price | $ 14.28 | $ 12.88 |  |  |  |  |
SSARs granted Weighted Average Exercise Price | $ 20.49 |  |  |  |  |  |
Options / SSARs exercised Weighted Average Exercise Price | $ 9.03 |  |  |  |  |  |
Options / SSARs cancelled Weighted Average Exercise Price | $ 0.00 |  |  |  |  |  |
Options / SSARs outstanding Weighted Average Contractual Term (in years) | 5.2 |  |  |  |  |  |
Options / SSARs outstanding Aggregate Intrinsic Value (in millions) | $ 37.4 |  |  |  |  |  |
Vested and expected to vest | 6,615,000 |  |  |  |  |  |
Vested and expected to vest Aggregate Intrinsic Value (in millions) | 35.5 |  |  |  |  |  |
Options / SSARs exercisable | 5,724,000 |  |  |  |  |  |
Options / SSARs exercisable Weighted Average Exercise Price | $ 14.72 |  |  |  |  |  |
Options / SSARs exercisable Aggregate Intrinsic Value (in millions) | 29.9 |  |  |  |  |  |
Weighted-average period of years costs are expected to be recognied over |  |  |  |  | 1 year 4 months 24 days |  |
Compensation Expense |  |  |  |  |  | 2.5 |
Unrecognized compensation costs |  |  |  |  | $ 5.0 | $ 5.0 |
Vesting Period |  |  |  |  |  |  | 3 years
Starting Term When Options Become Exercisable After Grant Date |  |  | 3 months |  |  |  |
Number of Shares Available for Grant |  |  |  |  | 5,600,000 | 5,600,000 |
Number of months for options to vest at an incremental rate of ten percent for directors |  |  |  | 3 months |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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