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Investments - Amortized Costs and Estimated Fair Value (Details) $ in Millions	Jun. 30, 2024 USD ($)
Amortized Cost
Due in One Year or Less	$ 278.2
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost	828.4
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Amortized Cost	1,076.1
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost	3,593.5
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost	1,770.7
Fixed maturities, at amortized cost	7,546.9
Fair Value
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value	272.4
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value	799.4
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value	931.9
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value	3,038.8
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	1,632.2
Debt Securities, Available-for-Sale	$ 6,674.7

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Debt Securities, Available-For-Sale, Including Disposal Group And Discontinued Operations

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+ References

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-Topic 320
-SubTopic 10
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-Section 50
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-Publisher FASB
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+ References

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