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Total net investment income and net realized and unrealized investment gains - Net Unrealized Investment Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Debt securities, trading	$ 1.8	$ 5.4
Short-term investments	(0.2)	(0.9)
Derivative instruments	(0.2)	1.0
Other long-term investments	2.6	1.3
Net investment income (loss) on cash and cash equivalents	1.1	(2.1)
Net unrealized investment gains	$ 5.1	$ 4.7

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- Definition

Cash And Cash Equivalents, Unrealized Gain (Loss)

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Other Long-term Investments, Unrealized Gain (Loss)

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Other Short-term Investments, Unrealized Gain (Loss)

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Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Amount of unrealized gain (loss) on investment.

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