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Stock-Based Compensation Outstanding Options and SSARs (Details) - Relationship to Entity [Domain] - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 6 Months Ended |
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Jun. 30, 2015 | Dec. 31, 2014
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, 2015 | 7,004 |
Incentive shares granted | 379 |
Options / SSARs exercised | (1,141) |
Options / SSARs canceled | (281) |
Options / SSARs outstanding at June 30, 2015 | 5,961 |
Options / SSARs outstanding Weighted Average Exercise Price | $ 14.32 | $ 14.19
Options / SSARs granted Weighted Average Exercise Price | 17.04 |
Options / SSARs exercised Weighted Average Exercise Price | 11.45 |
Options / SSARs canceled Weighted Average Exercise Price | $ 26.41 |
Options / SSARs outstanding Weighted Average Contractual Term (in years) | 4 years 8 months 16 days |
Options / SSARs outstanding Aggregate Intrinsic Value (in millions) | $ 28.3 |
Vested and expected to vest | 5,663 |
Vested and expected to vest Aggregate Intrinsic Value (in millions) | $ 26.9 |
Options / SSARs exercisable | 5,185 |
Options / SSARs exercisable Weighted Average Exercise Price | $ 13.78 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term | 4 years 26 days |
Options / SSARs exercisable Aggregate Intrinsic Value (in millions) | $ 28.3 |
Options and SSARs [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Weighted-average period of years costs are expected to be recognied over | 1 year 9 months 18 days |
Compensation Expense | $ 1.9 |
Unrecognized compensation costs | $ 5.7 |
Number of Shares Available for Grant | 3,900 |
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] |  |
Vesting Period | 3 years |

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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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: 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 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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