Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
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| Income Tax Disclosure [Abstract] | ||
| Tax losses and research and development tax credits | $ 522.0 | $ 549.0 |
| Share-based compensation | 58.0 | 41.0 |
| Lease liabilities | 28.0 | 25.0 |
| Fixed assets | 25.0 | 21.0 |
| Other | 28.0 | 38.0 |
| Total gross deferred tax assets | 661.0 | 674.0 |
| Less: Valuation allowance | (11.3) | (26.4) |
| Total deferred tax assets, net of valuation allowance | 650.0 | 648.0 |
| Deferred income | (213.0) | (206.0) |
| Outside basis differences | (44.0) | (52.0) |
| Right-of-use assets | (23.0) | (23.0) |
| Acquired intangibles | (6.0) | (6.0) |
| Other | (28.0) | (1.0) |
| Total deferred tax liabilities | (314.0) | (288.0) |
| Net deferred tax assets (liabilities) | $ 336.0 | $ 360.0 |
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- Definition Deferred Tax Asset, Lease Liability No definition available.
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- Definition Deferred Tax Liabilities, Deferred Income No definition available.
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- Definition Deferred Tax Liabilities, Outside Basis Difference No definition available.
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from in-process research and development cost acquired in business combination or from joint venture formation or both. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from leasing arrangements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of deferred tax liability attributable to taxable temporary differences classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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