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Share Plans (Tables) | 3 Months Ended
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Mar. 31, 2016
Share-based Compensation Expense | Total share-based compensation expense for the three months ended March 31, 2016 and March 28, 2015 was as follows:
| Three months ended
In millions | March 31, 2016 | March 28, 2015
Restricted stock units | $ | 7.0 |  | $ | 6.2 |
Stock options | 5.4 |  | 3.5 |
Performance share units | 3.7 |  | — |
Total share-based compensation expense | $ | 16.1 |  | $ | 9.7 |
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:
| 2016 Annual Grant
Risk-free interest rate | 1.57 | %
Expected dividend yield | 2.47 | %
Expected share price volatility | 27.3 | %
Expected term (years) | 5.9 |

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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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