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Short-Duration Insurance Contracts - Summary of Reinsurance Reserve Balances (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Gross reserves, beginning of year | $ 581.7 |
Claims and claim expense payments for claims occurring during: |  |
Gross reserves, end of year | 584.4 |
Group Benefits |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Gross reserves, beginning of year | 116.6 | $ 121.6
Less: reinsurance recoverables | 27.7 | 27.9
Net reserves, beginning of year | 88.9 | 93.7
Incurred claims and claim expenses: |  |
Claims occurring in the current year | 20.2 | 20.2
Decrease in estimated reserves for claims occurring in prior years | (6.1) | (4.9)
Total claims and claim expenses incurred | 14.1 | 15.3
Claims and claim expense payments for claims occurring during: |  |
Current year | 3.9 | 4.2
Prior years | 12.4 | 12.4
Total claims and claim expense payments | 16.3 | 16.6
Net reserves, end of year | 86.7 | 92.3
Plus: reinsurance recoverables | 27.6 | 28.0
Gross reserves, end of year | 114.3 | 120.3
Property & Casualty |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Gross reserves, beginning of year | 416.8 | 388.7
Less: reinsurance recoverables | 104.0 | 100.8
Net reserves, beginning of year | 312.8 | 287.9
Incurred claims and claim expenses: |  |
Claims occurring in the current year | 124.7 | 128.8
Decrease in estimated reserves for claims occurring in prior years | 0.0 | 0.0
Total claims and claim expenses incurred | 124.7 | 128.8
Claims and claim expense payments for claims occurring during: |  |
Current year | 44.6 | 40.6
Prior years | 78.3 | 79.6
Total claims and claim expense payments | 122.9 | 120.2
Net reserves, end of year | 314.6 | 296.5
Plus: reinsurance recoverables | 103.6 | 101.3
Gross reserves, end of year | $ 418.2 | $ 397.8

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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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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -SubTopic 40 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -SubTopic 40 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: 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 3: 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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