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Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2026 | Jun. 30, 2025
Segment Reporting [Line Items] |  |
Total revenue | $ 1,289.0 | $ 1,053.0
Staff costs: Share-based compensation cost (equity settled) | (343.0) | (241.0)
Operating income (loss) | 91.0 | 114.0
Income (loss) from equity investments, net | 128.0 | 4.0
Interest income, net | 31.0 | 27.0
Other non-operating income (loss), net | 3.0 | 1.0
Income (loss) before income taxes | 253.0 | 146.0
Income tax benefit (expense) | 17.0 | (16.0)
Net income (loss) | 270.0 | 130.0
Reportable Segment |  |
Segment Reporting [Line Items] |  |
Total revenue | 1,289.0 | 1,053.0
Staff costs: Salaries, bonuses and benefits | (449.0) | (389.0)
Staff costs: Share-based compensation cost (equity settled) | (343.0) | (241.0)
Staff costs: Employer taxes related to share-based compensation | (98.0) | (58.0)
Project materials costs, third-party fees paid to consultants, information technology, research and development expenses (excluding employee-related expenses), accounting and legal professional services fees, advertising expenses, and other corporate-related expenses | (233.0) | (192.0)
Amortization | (27.0) | (24.0)
Depreciation | (48.0) | (36.0)
Other non-staff costs | 0.0 | 1.0
Operating income (loss) | $ 91.0 | $ 114.0
Operating margin | 7.00% | 11.00%
Income (loss) from equity investments, net | $ 128.0 | $ 4.0
Interest income, net | 31.0 | 27.0
Other non-operating income (loss), net | 3.0 | 1.0
Income (loss) before income taxes | 253.0 | 146.0
Income tax benefit (expense) | 17.0 | (16.0)
Net income (loss) | 270.0 | 130.0
License and Other Revenue |  |
Segment Reporting [Line Items] |  |
Total revenue | 574.0 | 468.0
License and Other Revenue | Reportable Segment |  |
Segment Reporting [Line Items] |  |
Total revenue | 574.0 | 468.0
Royalty Revenue |  |
Segment Reporting [Line Items] |  |
Total revenue | 715.0 | 585.0
Royalty Revenue | Reportable Segment |  |
Segment Reporting [Line Items] |  |
Total revenue | $ 715.0 | $ 585.0

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Name: | srt_ProductOrServiceAxis=us-gaap_RoyaltyMember
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Data Type: | na
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