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Total net investment income and net realized and unrealized investment gains - Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 8.9	$ 5.5
Gross realized losses	(14.3)	(9.2)
Net realized losses on investments	(5.4)	(3.7)
Net unrealized gains on investments	5.1	4.7
Net realized and unrealized gains (losses) on investments	(0.3)	1.0
Realized and unrealized gains (losses) from related party investments	$ 2.6	$ (1.9)

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-Topic 220
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Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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