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v3.25.1

Variable and voting interest entities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024
Variable Interest Entity [Line Items] |  |  |
Assets | $ 12,280.5 | $ 12,524.9 |
Liabilities | 10,253.8 | 10,586.1 |
Related Party Fund - Third Point Venture Offshore Fund I LP |  |  |
Variable Interest Entity [Line Items] |  |  |
Unfunded commitments | 7.1 | 9.3 |
Related Party Fund - Third Point Venture Offshore Fund II LP |  |  |
Variable Interest Entity [Line Items] |  |  |
Unfunded commitments | 18.2 | 19.7 |
Alstead Re |  |  |
Variable Interest Entity [Line Items] |  |  |
Assets | 6.6 | 6.3 |
Liabilities | $ 0.8 | 0.8 |
Arcadian |  |  |
Variable Interest Entity [Line Items] |  |  |
Estimated fair value of retained noncontrolling interest |  |  | $ 115.0
VIE, ownership percentage | 49.00% |  |
Alta Signa |  |  |
Variable Interest Entity [Line Items] |  |  |
Assets | $ 2.7 | 1.8 |
Liabilities | $ 1.2 | $ 0.8 |
VOE, ownership percentage | 75.10% |  |
TP Enhanced Fund | TP Enhanced Fund |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE, ownership percentage | 89.10% |  |
Variable interest entity, primary beneficiary | TP Enhanced Fund | TP GP |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE, ownership percentage | 10.90% |  |

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