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Future Policy Benefits and Claims - Reconciliation of Unpaid Claims to Liability for Unpaid Claims Table (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Future Policy Benefits and Claims |  |  |  |
Net outstanding liabilities for unpaid claims | $ 1,401.5 |  |  |
Reconciling items |  |  |  |
Reinsurance recoverable on unpaid claims | 39.3 |  |  |
Impact of discounting | (215.0) |  |  |
Loss adjustment expense liability | 37.6 |  |  |
Liability for unpaid claims - short duration contracts |  | $ 1,295.6 |  |
Insurance contracts other than short duration | 142.5 |  |  |
Liability for unpaid claims | 1,405.9 | 1,395.0 | $ 1,370.9 | $ 1,686.0
Long-Term Disability/Group Life Waiver |  |  |  |
Future Policy Benefits and Claims |  |  |  |
Net outstanding liabilities for unpaid claims | 1,237.9 |  |  |
Reconciling items |  |  |  |
Reinsurance recoverable on unpaid claims | 39.2 |  |  |
Impact of discounting | (215.0) | (209.4) |  |
Loss adjustment expense liability | 20.5 |  |  |
Liability for unpaid claims - short duration contracts | 1,082.6 | 1,076.2 |  |
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML |  |  |  |
Future Policy Benefits and Claims |  |  |  |
Net outstanding liabilities for unpaid claims | 79.1 |  |  |
Reconciling items |  |  |  |
Loss adjustment expense liability | 4.6 |  |  |
Liability for unpaid claims - short duration contracts | 83.7 | 79.7 |  |
Group Life |  |  |  |
Future Policy Benefits and Claims |  |  |  |
Net outstanding liabilities for unpaid claims | 84.5 |  |  |
Reconciling items |  |  |  |
Reinsurance recoverable on unpaid claims | 0.1 |  |  |
Loss adjustment expense liability | 12.5 |  |  |
Liability for unpaid claims - short duration contracts | $ 97.1 | $ 73.6 |  |

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer, related to short-duration insurance contracts. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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