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Share plans | 9 Months Ended
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Sep. 29, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share plans | Share plans Total share-based compensation expense for the Third Quarter and three-quarters ended September 29, 2019, and September 30, 2018, was as follows:
|  | Third Quarter |  | Year-to-date |
| In millions | 2019 |  | 2018 |  | 2019 | 2018 |
| Total share-based compensation charges | $ | 0.6 |  |  | $ | 1.2 |  |  | $ | 4.0 |  | $ | 3.1 |  |
In March 2019, we issued our annual share-based compensation grants under the Luxfer Holdings PLC Long-Term Umbrella Incentive Plan. The total number of awards issued was approximately 200,000 and the weighted-average fair value of options granted in 2019 was estimated to be $17.70 per share. In May 2019, we issued our annual share-based compensation grants under the Luxfer Holdings PLC Non-Executive Directors Equity Incentive Plan. The total number of awards issued was approximately 4,000 and the weighted-average fair value of options granted was estimated to be $15.00 per share. The following table illustrates the assumptions used in deriving the fair value of share options granted during 2019 and the year-ended December 31, 2018,:
|  | 2019 |  | 2018 |
| Dividend yield (%) | 4.00 |  | 4.00 |
| Expected volatility range (%) | 22.65 |  | 22.65 - 35.77 |
| Risk-free interest rate (%) | 0.12 |  | 0.12 - 2.57 |
| Expected life of share options range (years) | 1.00 - 4.00 |  | 0.50 - 6.00 |
| Weighted average exercise price ($) | $0.89 |  | $0.65 |
| Model used | Black-Scholes & Monte-Carlo |  | Black-Scholes & Monte-Carlo |
The expected life of the share options is based on historical data and current expectations, and is not necessarily indicative of exercise patterns that may occur. The expected volatility reflects the assumption that the historical volatility over a period similar to the life of the options is indicative of future trends, which may not necessarily be the actual outcome.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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