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Income Taxes (Tables)

12 Months Ended

Mar. 31, 2025

Income Tax Disclosure [Abstract]

Components of Income Tax Expense

Income tax expense consists of the following components: 

						Years Ended 31 March
(Millions of US dollars)						2025						2024						2023
Income before income taxes:
Domestic						$	175.8					$	239.1					$	270.0
Foreign						469.6						515.7						453.5
Income before income taxes						$	645.4					$	754.8					$	723.5
Income tax expense:
Current:
Domestic						$	30.0					$	38.7					$	42.9
Foreign						90.0						133.0						81.4
Current income tax expense						120.0						171.7						124.3
Deferred:
Domestic						16.3						17.3						11.8
Foreign						85.1						55.6						75.4
Deferred income tax expense						101.4						72.9						87.2
Total income tax expense						$	221.4					$	244.6					$	211.5

Reconciled Tax at Statutory Rates

Income tax expense is reconciled to the tax at the statutory rates as follows:

						Years Ended 31 March
(Millions of US dollars)						2025						2024						2023
Income tax expense computed at the statutory tax rates						$	117.9					$	135.1					$	135.1
US state income taxes, net of the federal benefit						15.2						14.0						10.6
Asbestos - effect of foreign exchange						—						(3.2)						(13.3)
Expenses not deductible						14.2						3.6						3.3
Stock and executive compensation						2.4						7.6						1.9
Foreign taxes on domestic income						50.8						60.2						61.2
Taxes on foreign income						17.2						17.7						12.0
Net deferred tax remeasurement						(1.1)						7.3						2.3
Other items						4.8						2.3						(1.6)
Total income tax expense						$	221.4					$	244.6					$	211.5
Effective tax rate						34.3		%				32.4		%				29.2		%

Deferred Tax Assets and Liabilities

The tax effects of significant temporary differences creating deferred tax assets and liabilities were:

						31 March
(Millions of US dollars)						2025						2024
Deferred tax assets:
Intangible assets						$	756.7					$	833.4
Asbestos liability						284.5						294.0
Tax credit carryforwards						111.8						113.4
Other provisions and accruals						99.1						90.4
Net operating loss carryforwards						77.4						77.9
Total deferred tax assets						1,329.5						1,409.1
Valuation allowance						(256.9)						(257.0)
Total deferred tax assets net of valuation allowance						1,072.6						1,152.1
Deferred tax liabilities:
Depreciable and amortizable assets						(170.7)						(150.7)
Deferred tax on unremitted earnings						(63.0)						(46.7)
Intangible assets						(40.3)						(41.7)
Other						(34.8)						(36.1)
Total deferred tax liabilities						(308.8)						(275.2)
Total deferred taxes, net						$	763.8					$	876.9

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- Definition

Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-9

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- Definition

Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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- Definition

Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

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