XML 116 R75.htm IDEA: XBRL DOCUMENT
v3.21.1

Asbestos - Additional Information (Details) $ in Millions, $ in Millions | 12 Months Ended | 60 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 AUD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 AUD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 AUD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 AUD ($) | Mar. 31, 2021 AUD ($)
Schedule Of Asbestos Claims [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid to AICF |  | $ 153.3 |  | $ 108.9 |  | $ 103.0 |  | $ 558.5 | $ 771.7 |
Net cash provided by operating activities |  | 786.9 |  | 451.2 |  | 304.0 |  |  |  |
Secured standby loan facility maximum borrowing capacity |  | 243.2 |  |  |  |  |  |  |  | $ 320.0
Restricted Cash and Investments |  |  |  |  |  |  |  |  |  |
Schedule Of Asbestos Claims [Line Items] |  |  |  |  |  |  |  |  |  |
Payment received in accordance with AFFA |  | $ 153.3 | $ 220.9 | $ 108.9 | $ 156.7 | $ 103.0 | $ 138.4 |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Schedule Of Asbestos Claims [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities | $ 786.9 |  |  |  |  |  |  |  |  |
Adjustment to net cash provided by (used in) operating activities | 65.3 |  |  |  |  |  |  |  |  |
Scenario, Forecast | AICF Funding |  |  |  |  |  |  |  |  |  |
Schedule Of Asbestos Claims [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid to AICF | $ 252.6 |  |  |  |  |  |  |  |  |
Maximum percentage of free cash flow contributed to AICF (as percent) | 35.00% |  |  |  |  |  |  |  |  |
Net cash provided by operating activities | $ 721.6 |  |  |  |  |  |  |  |  |
Central Estimate – Discounted and Inflated |  |  |  |  |  |  |  |  |  |
Schedule Of Asbestos Claims [Line Items] |  |  |  |  |  |  |  |  |  |
Discounted actuarial estimate, potential period shift |  | 2 years | 2 years |  |  |  |  |  |  |
Discounted actuarial estimate, potential percent increase |  | 21.00% |  |  |  |  |  |  |  | 21.00%

X
- Definition Adjustment to Net Cash Provided by (Used in) Operating Activities + References No definition available. + Details
Name: | jhx_AdjustmenttoNetCashProvidedbyUsedinOperatingActivities
Namespace Prefix: | jhx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Discounted Actuarial Estimate Potential Percent Increase + References No definition available. + Details
Name: | jhx_DiscountedActuarialEstimatePotentialPercentIncrease
Namespace Prefix: | jhx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Discounted Actuarial Estimate, Potential Period Shift + References No definition available. + Details
Name: | jhx_DiscountedActuarialEstimatePotentialPeriodShift
Namespace Prefix: | jhx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of Free Cash Flow (as defined in the Amended and Restated Final Funding Agreement) in any given Financial year that is contributed to the Asbestos Injuries Compensation Fund in the next Financial Year. + References No definition available. + Details
Name: | jhx_MaximumPercentageOfFreeCashFlowContributedToAsbestosInjuriesCompensationFund
Namespace Prefix: | jhx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Under the terms of the Amended and Restated Final Funding Agreement (AFFA), a wholly owned Australian subsidiary (the Performing Subsidiary) has an obligation to make payments to the AICF on an annual basis. The amount of these annual payments is dependent on several factors, including the Company's free cash flow (as defined by the AFFA), actuarial estimations, actual claims paid, operating expenses of the AICF and the annual cash flow cap. + References No definition available. + Details
Name: | jhx_PaymentToFund
Namespace Prefix: | jhx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments received in accordance with amended and restated final funding agreement. + References No definition available. + Details
Name: | jhx_PaymentsReceivedInAccordanceWithAmendedAndRestatedFinalFundingAgreement
Namespace Prefix: | jhx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Schedule Of Asbestos Claims [Line Items] + References No definition available. + Details
Name: | jhx_ScheduleOfAsbestosClaimsLineItems
Namespace Prefix: | jhx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the standby loan facility entered into between the Obligors (AICF, Amaca, Amaba and ABN 60) and the State of New South Wales, Australia + References No definition available. + Details
Name: | jhx_SecuredStandbyLoanFacilityMaximumBorrowingCapacity
Namespace Prefix: | jhx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInOperatingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=jhx_RestrictedCashAndShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=jhx_AsbestosInjuriesCompensationFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessInterruptionLossAxis=jhx_DiscountedAndInflatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |