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Equity Investments - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Schedule of Equity Method Investments [Line Items]      
Equity method investments under fair value option $ 141.0   $ 148.0
Gains (losses) on equity method investments (8.0) $ (1.0)  
Equity investments in publicly listed companies 290.0   96.0
Equity investments in publicly listed companies 126.0 4.0  
Non-marketable equity securities 146.0   130.0
Gains (losses) on non-marketable equity securities (includes NAV) 10.0 1.0  
Dividends from equity investments 2.4 1.1  
Financial commitments to investees, off balance sheet 24.3   25.6
Kigen (UK) Limited      
Schedule of Equity Method Investments [Line Items]      
Non-marketable equity securities 16.4   16.4
Acetone Limited      
Schedule of Equity Method Investments [Line Items]      
Gains (losses) on equity method investments (5.0) 0.0  
Equity method investments, fair value 51.5   56.5
Publicly Listed Companies      
Schedule of Equity Method Investments [Line Items]      
Equity investments in publicly listed companies 289.6   96.1
Equity investments in publicly listed companies 125.6 3.8  
Raspberry Pi Holdings PLC      
Schedule of Equity Method Investments [Line Items]      
Payments to acquire equity securities 67.9    
Fair Value Measured at Net Asset Value Per Share      
Schedule of Equity Method Investments [Line Items]      
Equity method investments under fair value option 89.1   91.3
Gains (losses) on equity method investments (2.2) (2.0)  
Non-marketable equity securities 30.3   $ 27.2
Gains (losses) on non-marketable equity securities (includes NAV) $ 1.6 $ 1.1