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Share Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Share-based Compensation Expense | Total share-based compensation expense for the three and six months ended June 30, 2019 and 2018 was as follows:
| Three months ended |  | Six months ended
In millions | June 30, 2019 | June 30, 2018 |  | June 30, 2019 | June 30, 2018
Restricted stock units | $ | 2.9 |  | $ | 1.9 |  |  | $ | 5.7 |  | $ | 4.3 |
Stock options | 1.1 |  | 1.0 |  |  | 2.5 |  | 2.2 |
Performance share units | 1.3 |  | 2.4 |  |  | 2.5 |  | 4.8 |
Total share-based compensation expense | $ | 5.3 |  | $ | 5.3 |  |  | $ | 10.7 |  | $ | 11.3 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | 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:
| 2019 Annual Grant
Risk-free interest rate | 2.89 | %
Expected dividend yield | 1.78 | %
Expected share price volatility | 23.3 | %
Expected term (years) | 6.1 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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