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Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement [Abstract]

Schedule of Stock-Based Compensation Expense

Total stock-based compensation expense consists of the following:

			Years Ended 31 March
(Millions of US dollars)			2022						2021						2020
Liability Awards			$	3.2					$	21.7					$	2.8
Equity Awards			9.0						18.0						10.3
Total stock-based compensation expense			$	12.2					$	39.7					$	13.1

Summary of Stock Options Available for Grant

The following table summarizes the Company’s shares available for grant as options, RSUs or other equity instruments under the LTIP and 2001 Plan:

			Shares Available for Grant
Balance at 31 March 2020			22,944,379
Granted			(856,756)
Balance at 31 March 2021			22,087,623
Granted			(597,927)
Balance at 31 March 2022			21,489,696

Restricted Stock Unit Activity

The following table summarizes the Company’s RSU activity:

(Units)			Service Vesting (2001 Plan)						Performance Vesting (LTIP)						Market Conditions (LTIP)						Total						Weighted Average Fair Value at Grant Date (A$)
Outstanding at 31 March 2020			520,632						864,165						1,777,640						3,162,437						14.64
Granted			371,806						190,376						294,574						856,756						26.56
Vested			(245,385)						(174,356)						(722,156)						(1,141,897)						13.03
Forfeited			(53,567)						(153,897)						(63,136)						(270,600)						17.05
Outstanding at 31 March 2021			593,486						726,288						1,286,922						2,606,696						19.01
Granted			233,443						141,015						223,469						597,927						41.73
Vested			(313,641)						(248,202)						(565,878)						(1,127,721)						14.96
Forfeited			(98,613)						(327,397)						(450,480)						(876,490)						27.73
Outstanding at 31 March 2022			414,675						291,704						494,033						1,200,412						27.83

Assumptions Used for Restricted Stock Grants

The following table includes the assumptions used for RSU grants (market condition) valued:

Vesting Condition:			Market						Market						Market						Market
			FY22						FY22						FY21						FY21
Date of grant			27 Aug 2021						9 Sep 2021						15 Sep 2020						5 Nov 2020
Dividend yield (per annum)			2.0		%				2.0		%				—		%				1.3		%
Expected volatility			40.0		%				40.2		%				39.2		%				40.1		%
Risk free interest rate			0.4		%				0.4		%				0.2		%				0.2		%
Expected life in years			3.0						2.9						2.9						2.8
JHX stock price at grant date (A$)			52.66						52.12						30.33						37.24
Number of restricted stock units			130,513						92,956						167,491						127,083

Cash Settled Units Activity

The following represents the activity related to the CSUs:

						FY22						FY21
Granted						423,051						571,132
Vested						433,872						377,506
Cancelled						1,292,934						607,253

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