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Fair Value of Financial Instruments - Financial Instrument Not Carried at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Level 1 |  |
Investments |  |
Other investments | $ 0.0 | $ 0.0
Deposit asset on reinsurance | 0.0 | 0.0
Financial Liabilities |  |
Policyholders' account balances | 0.0 | 0.0
Reverse repurchase agreement | 0.0 |
Other policyholder funds | 0.0 | 0.0
Long-term debt | 0.0 | 0.0
Level 2 |  |
Investments |  |
Other investments | 34.9 | 33.8
Deposit asset on reinsurance | 0.0 | 0.0
Financial Liabilities |  |
Policyholders' account balances | 0.0 | 0.0
Reverse repurchase agreement | 51.8 |
Other policyholder funds | 933.7 | 908.7
Long-term debt | 569.8 | 571.4
Level 3 |  |
Investments |  |
Other investments | 187.1 | 187.9
Deposit asset on reinsurance | 2,192.2 | 2,259.6
Financial Liabilities |  |
Policyholders' account balances | 4,657.8 | 4,861.8
Reverse repurchase agreement | 0.0 |
Other policyholder funds | 7.4 | 7.3
Long-term debt | 0.0 | 0.0
Carrying Amount |  |
Investments |  |
Other investments | 218.7 | 218.4
Deposit asset on reinsurance | 2,472.4 | 2,496.6
Financial Liabilities |  |
Policyholders' account balances | 5,052.6 | 4,996.3
Reverse repurchase agreement | 50.0 |
Other policyholder funds | 941.1 | 916.0
Long-term debt | 546.2 | 546.0
Fair Value |  |
Investments |  |
Other investments | 222.0 | 221.7
Deposit asset on reinsurance | 2,192.2 | 2,259.6
Financial Liabilities |  |
Policyholders' account balances | 4,657.8 | 4,861.8
Reverse repurchase agreement | 51.8 |
Other policyholder funds | 941.1 | 916.0
Long-term debt | $ 569.8 | $ 571.4

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- Definition Deposit Asset On Reinsurance Fair Value Disclosure + References No definition available. + Details
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- Definition Fair Value of the liability as of the balance sheet date to the policyholders for funds held that are returnable under the terms of insurance contracts that were not separately reported. + References No definition available. + Details
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- Definition Policyholder Funds, Fair Value + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Amount of investments classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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