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Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2025

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)			2025						2024						2023
Liability Awards			$	2.7					$	17.3					$	2.7
Equity Awards			23.0						28.2						15.7
Total stock-based compensation expense			$	25.7					$	45.5					$	18.4

Summary of Stock Options Available for Grant

The following 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 2023			18,948,803
Granted			(1,169,733)
Balance at 31 March 2024			17,779,070
Granted			(1,175,352)
Balance at 31 March 2025			16,603,718

Schedule of Stock Options Roll Forward

The following summarizes the Company’s stock options activity during the noted period:

						Outstanding Options
						Number of Options						Weighted Average Exercise Price (A$)
Balance at 31 March 2023						269,221						33.05
Granted						—						—
Balance at 31 March 2024						269,221						33.05
Granted						—						—
Balance at 31 March 2025						269,221						33.05
Options exercisable at 31 March 2025						—						—

Restricted Stock Unit Activity

The following 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 2023			1,136,526						372,029						870,044						2,378,599						26.97
Granted			533,278						176,624						459,831						1,169,733						43.20
Vested			(373,440)						(90,452)						(42,581)						(506,473)						30.88
Forfeited			(68,712)						(13,299)						(173,643)						(255,654)						25.63
Outstanding at 31 March 2024			1,227,652						444,902						1,113,651						2,786,205						33.36
Granted			527,577						250,826						396,949						1,175,352						45.57
Vested			(532,445)						(104,434)						(1,490)						(638,369)						35.86
Forfeited			(121,585)						(5,609)						(322,022)						(449,216)						28.64
Outstanding at 31 March 2025			1,101,199						585,685						1,187,088						2,873,972						38.64

Assumptions Used to Fair Value Restricted Stock Grants

The following includes the assumptions used to fair value the RSU grants (market condition):

Vesting Condition:						Market						Market
						FY25						FY24
Date of grant						17-Aug-24						1-Sep-23
Dividend yield (per annum)						—		%				—		%
Expected volatility						37.9		%				35.4		%
Risk free interest rate						3.9		%				4.6		%
Expected life in years						3.0						3.0
JHX stock price at grant date (A$)						51.99						46.72
Number of restricted stock units						396,949						451,945

Schedule of Fair Value of Restricted Stock Units Vested

The following presents the total fair value of all of our restricted stock units vested:

						Years ended 31 March
(Millions of US dollars)						2025						2024						2023
Total fair value vested						$	22.3					$	16.1					$	18.4

Cash Settled Units Activity

The following represents the activity related to the CSUs:

						FY25						FY24
Granted						500,610						529,875
Vested						232,420						177,955
Cancelled						88,382						125,144

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