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Share Plans (Tables) | 9 Months Ended
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Sep. 27, 2014
Share-based Compensation Expense | Total share-based compensation expense for the three and nine months ended September 27, 2014 and September 28, 2013 was as follows:
| Three months ended |  | Nine months ended
In millions | September 27, 2014 | September 28, 2013 |  | September 27, 2014 | September 28, 2013
Restricted stock units | $ | 5.6 |  | $ | 4.6 |  |  | $ | 16.7 |  | $ | 16.4 |
Stock options | 2.7 |  | 2.6 |  |  | 8.1 |  | 8.9 |
Total share-based compensation expense | $ | 8.3 |  | $ | 7.2 |  |  | $ | 24.8 |  | $ | 25.3 |
Assumptions Used in Calculating Estimated Fair Value of Stock Option Award | We estimated the fair value of each stock option award issued in the annual share-based compensation grant using a Black-Scholes option pricing model, modified for dividends and using the following assumptions:
| 2014 Annual Grant
Risk-free interest rate | 1.43 | %
Expected dividend yield | 1.45 | %
Expected share price volatility | 35.3 | %
Expected term (years) | 5.6 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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