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Stock-Based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2015
Additional Exceptional Long-Term Incentive Plan [Member] |
Summary of Fair Value of Balance Sheet Dates | The fair values at each of the balance sheet dates are summarized as follows:
(in millions) |  | 2015 |  |  | 2014 |
Balance at January 1 |  | $ | 0.1 |  |  | $ | 0.0 |
Compensation charge for the period |  |  | 0.1 |  |  |  | 0.1 |
Balance at March 31 |  | $ | 0.2 |  |  | $ | 0.1 |
Assumptions Used in the Monte Carlo Model | The following assumptions were used in the Monte Carlo model at March 31:
|  | 2015 |  |  | 2014 |
Dividend yield |  |  | 1.19 | % |  |  | 1.11 | %
Volatility of Innospec’s share price |  |  | 25.91 | % |  |  | 36.04 | %
Risk free interest rate |  |  | 0.89 | % |  |  | 0.90 | %
Stock Options Plan [Member] |
Summary of Transactions of the Company's Stock Option Plans | The following table summarizes the transactions of the Company’s stock option plans for the three months ended March 31, 2015:
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant-Date Fair Value |
Outstanding at December 31, 2014 |  |  | 728,640 |  |  | $ | 19.55 |  |  |  |  |
Granted - at discount |  |  | 54,717 |  |  | $ | 0.00 |  |  | $ | 36.18 |
- at market value |  |  | 23,550 |  |  | $ | 43.95 |  |  | $ | 9.89 |
Exercised |  |  | (113,920 | ) |  | $ | 6.25 |  |  |  |  |
Forfeited |  |  | (3,931 | ) |  | $ | 16.49 |  |  |  |  |
Outstanding at March 31, 2015 |  |  | 689,056 |  |  | $ | 20.96 |  |  |  |  |
Stock Equivalent Units [Member] |
Summarizes Transactions of SEUs | The following table summarizes the transactions of the Company’s SEUs for the three months ended March 31, 2015:
|  | Number of SEUs |  |  | Weighted Average Exercise Price |  |  | Weighted Average Grant-Date Fair Value |
Outstanding at December 31, 2014 |  |  | 286,563 |  |  | $ | 3.41 |  |  |  |  |
Granted - at discount |  |  | 69,280 |  |  | $ | 0.00 |  |  | $ | 36.65 |
- at market value |  |  | 6,336 |  |  | $ | 43.95 |  |  | $ | 9.89 |
Exercised |  |  | (81,695 | ) |  | $ | 2.31 |  |  |  |  |
Forfeited |  |  | (1,495 | ) |  | $ | 29.56 |  |  |  |  |
Outstanding at March 31, 2015 |  |  | 278,989 |  |  | $ | 3.67 |  |  |  |  |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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