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Stock-Based Compensation (Tables) | 12 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-Based Compensation Expense | Total stock-based compensation expense consists of the following:
| Years Ended 31 March
(Millions of US dollars) | 2019 |  | 2018 |  | 2017
Liability Awards (Income) Expense | $ | (0.6 | ) |  | $ | 5.6 |  |  | $ | 5.4 |
Equity Awards Expense | 12.5 |  |  | 11.1 |  |  | 9.3 |
Total stock-based compensation expense | $ | 11.9 |  |  | $ | 16.7 |  |  | $ | 14.7 |
Summary of Stock Options Available for Grant | The following table summarizes the Company’s shares available for grant as options, restricted stock units or other equity instruments under the LTIP and 2001 Plan at 31 March 2019, 2018 and 2017:
| Shares Available for Grant
Balance at 31 March 2017 | 27,238,814 |
Granted | (1,779,904 | )
Balance at 31 March 2018 | 25,458,910 |
Granted | (1,714,094 | )
Balance at 31 March 2019 | 23,744,816 |
Summary of Stock Options Activity | There were no stock options granted during the years ended 31 March 2019 and 2018. The following table summarizes the Company’s stock options activity during the noted periods:
| Outstanding Options
| Number |  | Weighted Average Exercise Price (A$)
Balance at 31 March 2017 | 48,896 |  |  | 6.38 |
Exercised | (48,896 | ) |  | 6.38 |
Balance at 31 March 2018 | — |  |  |
Exercised | — |  |  |
Balance at 31 March 2019 | — |  |  |
Restricted Stock Unit Activity | The following table summarizes the Company’s restricted stock unit activity during the noted period:
| Restricted Stock Units |  | Weighted Average Fair Value at Grant Date (A$)
Non-vested at 31 March 2017 | 3,340,245 |  |  | 14.80 |
Granted | 1,779,904 |  |  | 14.04 |
Vested | (615,334 | ) |  | 12.05 |
Forfeited | (367,223 | ) |  | 14.12 |
Non-vested at 31 March 2018 | 4,137,592 |  |  | 14.63 |
Granted | 1,714,094 |  |  | 14.12 |
Vested | (745,787 | ) |  | 15.53 |
Forfeited | (844,391 | ) |  | 13.71 |
Non-vested at 31 March 2019 | 4,261,508 |  |  | 14.47 |
Assumptions Used for Restricted Stock Grants | The following table includes the assumptions used for restricted stock grants (market condition) valued during the year ended 31 March 2019 and 2018, respectively:
Vesting Condition: | Market |  | Market |  | Market
| FY19 |  | FY19 |  | FY18
Date of grant | 6 Sep 2018 |  |  | 17 Aug 2018 |  |  | 21 Aug 2017 |
Dividend yield (per annum) | 3.0 | % |  | 3.0 | % |  | 3.0 | %
Expected volatility | 26.8 | % |  | 28.1 | % |  | 30.1 | %
Risk free interest rate | 2.7 | % |  | 2.7 | % |  | 1.5 | %
Expected life in years | 2.9 |  |  | 3.0 |  |  | 3.3 |
JHX stock price at grant date (A$) | 20.87 |  |  | 22.00 |  |  | 17.91 |
Number of restricted stock units | 49,381 |  |  | 663,738 |  |  | 932,393 |

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- Definition Tabular disclosure of the assumptions used to determine the fair value of restricted stock grants, including but not limited to expected volatility, dividend yield, risk free interest rate and the expected life. + References No definition available. + Details
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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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