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Stock Based Compensation (Details 3) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Additional disclosures |  |  |
Stock based compensation expense | $ 51.8 | $ 33.5 | $ 39.5
Stock Appreciation Rights |  |  |
Stock-Based Compensation arrangements |  |  |
Contractual term | 7 years |  |
Graded vesting rights | 3 years |  |
Vesting rights | one-third of the award becoming exercisable each year on the anniversary date of the grant |  |
Shares |  |  |
Outstanding at the beginning of the period (in shares) | 1,722,444 | 2,576,260 | 2,942,600
Granted (in shares) |  | 240,884 | 383,000
Exercised (in shares) | (1,054,680) | (1,094,700) | (749,340)
Outstanding at the end of the period (in shares) | 667,764 | 1,722,444 | 2,576,260
Exercisable at the end of the period (in shares) | 386,582 | 1,145,972 | 1,805,328
Weighted-Average Exercise Price (in dollars per share) |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 9.75 | $ 8.02 | $ 7.64
Granted (in dollars per share) |  | $ 17.59 | $ 10.19
Exercised (in dollars per share) | $ 7.92 | $ 7.42 | $ 7.61
Outstanding at the end of the period (in dollars per share) | $ 12.63 | $ 9.75 | $ 8.02
Exercisable (in dollars per share) | $ 11.33 | $ 7.97 | $ 7.57
Additional disclosures |  |  |
Aggregate intrinsic value of stock appreciation rights outstanding | 17.4 |  |
Weighted-average remaining contractual term of non-vested shares | 4 years 3 months 18 days |  |
Aggregate intrinsic value of stock appreciation rights exercisable | 10.6 |  |
Stock appreciation rights exercisable, weighted average remaining contractual term | 4 years 1 month 6 days |  |
Stock based compensation expense | 0.3 | 1.9 | 2.1
Compensation expenses related to the immediate expensing of shares granted to retirement-eligible employees |  | 1.2 | 0.1
Unamortized compensation expense | $ 0.1 |  |
Unrecognized compensation expense recognition period | 1 year |  |
Weighted-average value per SAR granted during the period (in dollars per share) |  | $ 8.16 | $ 4.74
Assumptions |  |  |
Stock price volatility (as a percent) |  | 55.30% | 52.70%
Risk free rate of return (as a percent) |  | 0.90% | 2.30%
Expected dividend yield (as a percent) |  | 0.30% | 0.30%
Expected term |  | 5 years | 5 years

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- Definition Represents the expense recognized during the period, related to the immediate expensing of shares granted to retirement-eligible employees, 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 No definition available. + Details
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- Definition Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year). The vesting is graded over this period of time. + References No definition available. + Details
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- Definition The intrinsic value of vested and nonvested awards on equity-based plans excluding option plans (for example, stock appreciation rights plans) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units, as calculated by applying the disclosed pricing methodology. + References No definition available. + Details
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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of equity instruments other than options outstanding and currently exercisable under the share-based compensation plan as of the balance sheet date. + References No definition available. + Details
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- Definition The weighted average exercise price of exercisable awards on equity-based plans excluding option plans (for example, stock appreciation rights plans), including vested instruments. + References No definition available. + Details
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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 Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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.D.2) -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 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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