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Share Plans | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Share Plans | Share Plans 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 |
Of the total share-based compensation expense noted above, $1.3 million and $3.4 million were reported as part of (Loss) income from discontinued operations, net of tax for the three and six months ended June 30, 2018, respectively. In the first quarter of 2019, we issued our annual share-based compensation grants under the Pentair plc 2012 Stock and Incentive Plan to eligible employees. The total number of awards issued was approximately 0.8 million, of which 0.3 million were restricted stock units (“RSUs”), 0.4 million were stock options and 0.1 million were performance share units (“PSUs”). The weighted-average grant date fair value of the RSUs, stock options and PSUs issued was $40.84, $8.84, and $38.47, respectively. 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 |
These estimates require us to make assumptions based on historical results, observance of trends in our share price, changes in option exercise behavior, future expectations and other relevant factors. If other assumptions had been used, share-based compensation expense, as calculated and recorded under the accounting guidance, could have been affected. We based the expected life assumption on historical experience as well as the terms and vesting periods of the options granted. For purposes of determining expected share price volatility, we considered a rolling average of historical volatility measured over a period approximately equal to the expected option term. The risk-free interest rate for periods that coincide with the expected life of the options is based on the U.S. Treasury Department yield curve in effect at the time of grant.
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 |

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- Definition The entire disclosure for share-based payment arrangement. + 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 + Details
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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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