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Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2021

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)			2021						2020						2019
Liability Awards			$	21.7					$	2.8					$	(0.6)
Equity Awards			18.0						10.3						12.5
Total stock-based compensation expense			$	39.7					$	13.1					$	11.9

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 2019			23,744,816
Granted			(800,437)
Balance at 31 March 2020			22,944,379
Granted			(856,756)
Balance at 31 March 2021			22,087,623

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 2019			910,386						1,148,022						2,203,100						4,261,508						14.47
Granted			24,006						273,258						503,173						800,437						18.08
Vested			(304,591)						(207,271)						(362,973)						(874,835)						16.21
Forfeited			(109,169)						(349,844)						(565,660)						(1,024,673)						15.21
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

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						Market
			FY21						FY21						FY20						FY20						FY20
Date of grant1			15 Sep 2020						5 Nov 2020						25 Feb 2020						20 Sep 2019						9 Aug 2019
Dividend yield (per annum)			—		%				1.3		%				2.9		%				3.1		%				3.1		%
Expected volatility			39.2		%				40.1		%				26.6		%				26.6		%				27.8		%
Risk free interest rate			0.2		%				0.2		%				1.2		%				1.6		%				1.6		%
Expected life in years			2.9						2.8						2.5						2.9						2.0
JHX stock price at grant date (A$)			30.33						37.24						29.54						24.69						21.68
Number of restricted stock units			167,491						127,083						6,676						477,979						18,518

Cash Settled Units Activity

The following represents the activity related to the CSUs:

						FY21						FY20
Granted						571,132						791,217
Vested						377,506						129,549
Cancelled						607,253						328,935

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