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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.

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 3.

+ References

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Amount of transfers of assets measured on a recurring basis out of Level 3 of the fair value hierarchy into Level 2.

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Amount of transfers of net derivative assets (liabilities) measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 3.

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Amount of transfers of net derivative assets (liabilities) measured on a recurring basis out of Level 3 of the fair value hierarchy into Level 2.

+ References

No definition available.

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Fair Value Measurements - Transfers (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3, net derivative assets (liabilities)			$ 0.1
Transfers out of Level 3 into Level 2, net derivative assets (liabilities)				$ 0.3
Available-for-sale \| Fixed maturities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	$ 210.0	$ 307.8	451.9	188.3	$ 348.8
Transfers out of Level 3 into Level 2	111.6	179.0	289.9	263.8	435.6
Available-for-sale \| States and political subdivisions
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	15.5			12.0	80.3
Transfers out of Level 3 into Level 2				10.2
Available-for-sale \| Corporate debt securities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	58.9	89.5	212.4	176.3	175.8
Transfers out of Level 3 into Level 2		42.9	77.2	35.2
Available-for-sale \| Commercial mortgage-backed securities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 3 into Level 2				10.2
Available-for-sale \| Collateralized debt obligations
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3					72.1
Transfers out of Level 3 into Level 2		136.1	148.5	180.4	410.6
Available-for-sale \| Other debt obligations
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3	135.6	$ 218.3	239.5		20.6
Transfers out of Level 3 into Level 2	$ 111.6		$ 64.2	27.8	$ 25.0
Trading \| Fixed maturities
Fair Value Hierarchy Levels Transfers
Transfers out of Level 2 into Level 3				$ 29.0