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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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