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Total net investment income and net realized and unrealized investment gains - Net Unrealized Investment Losses on Other Long-Term Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Net Investment Income [Line Items]
Net unrealized investment losses on Other long-term investments	$ 2.6	$ 1.3
Hedge funds and private equity funds
Net Investment Income [Line Items]
Net unrealized investment losses on Other long-term investments	2.0	(0.6)
Strategic investments
Net Investment Income [Line Items]
Net unrealized investment losses on Other long-term investments	0.5	1.9
Other investments
Net Investment Income [Line Items]
Net unrealized investment losses on Other long-term investments	$ 0.1	$ 0.0

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- Definition

Other Long-term Investments, Unrealized Gain (Loss)

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(2)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

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