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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