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Related party transactions - Investments Managed by Related Parties (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Related Party Transaction [Line Items]
Total investments	$ 5,118.7	$ 5,705.5
Related Party
Related Party Transaction [Line Items]
Third Point Optimized Credit Portfolio	618.7	595.8
Total investments	735.2	712.3
Related Party | Third Point Enhanced LP
Related Party Transaction [Line Items]
Investments in related party investment funds, at fair value	83.8	87.6
Related Party | Related Party Fund - Third Point Venture Offshore Fund I LP
Related Party Transaction [Line Items]
Investments in related party investment funds, at fair value	26.4	24.0
Related Party | Related Party Fund - Third Point Venture Offshore Fund II LP
Related Party Transaction [Line Items]
Investments in related party investment funds, at fair value	$ 6.3	$ 4.9

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Sum of the carrying amounts as of the balance sheet date of all investments.

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