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Investments - Ratings and Fair Value of Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale	$ 4,635.2	$ 5,131.0
Debt securities, trading	117.6	162.2
AAA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale	703.0	808.5
Debt securities, trading	41.5	74.0
AA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale	2,111.7	2,227.9
Debt securities, trading	33.5	54.0
A
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale	1,039.1	1,375.0
Debt securities, trading	15.4	6.9
BBB
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale	638.9	659.2
Debt securities, trading	24.7	24.2
Other
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, available-for-sale	142.5	60.4
Debt securities, trading	$ 2.5	$ 3.1

X

- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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