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Schedule 3 - Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | $ 4,215.9 | $ 4,529.4 | $ 5,213.4
Other Income (Loss) | 8.2 | 7.2 | 9.2
Net Investment Income | 407.5 | 419.7 | 422.6
Insurance Claims and Policy- holders’ Benefits | 3,013.1 | 3,820.0 | 4,432.6
Amortization of Deferred Policy Acquisition Costs | 538.0 | 607.1 | 705.7
Other Insurance Expenses | 642.1 | 758.5 | 698.2
Deferred Policy Acquisition Costs | 630.0 | 591.6 |
Insurance Reserves | 5,821.0 | 6,102.9 |
Unearned Premiums | 1,275.3 | 1,300.8 |
Non-Core Operations |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 245.6 | 509.3 | 595.5
Premiums Written | 108.3 | 435.5 | 527.1
Other Income (Loss) | 0.0 | 0.0 | 0.0
Net Investment Income | 36.4 | 48.7 | 49.7
Insurance Claims and Policy- holders’ Benefits | 236.8 | 434.6 | 493.4
Amortization of Deferred Policy Acquisition Costs | 31.3 | 71.0 | 93.5
Other Insurance Expenses | 51.0 | 75.6 | 90.0
Deferred Policy Acquisition Costs | 4.1 | 22.0 |
Insurance Reserves | 261.7 | 356.4 |
Unearned Premiums | 50.3 | 188.7 |
Corporate and Other |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 0.0 | 0.0 | 0.0
Other Income (Loss) | 3.0 | 2.9 | 3.8
Net Investment Income | 10.9 | 9.3 | 15.7
Insurance Claims and Policy- holders’ Benefits | 0.1 | 0.1 | 0.2
Amortization of Deferred Policy Acquisition Costs | 0.0 | 0.0 | 0.0
Other Insurance Expenses | 66.2 | 201.9 | 75.2
Deferred Policy Acquisition Costs | 0.0 | 0.0 |
Insurance Reserves | 9.0 | 12.5 |
Unearned Premiums | 0.0 | 0.0 |
Specialty Property & Casualty Insurance | Operating Segments |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 3,576.4 | 3,632.5 | 4,046.4
Premiums Written | 3,685.4 | 3,305.4 | 3,934.4
Other Income (Loss) | 4.7 | 4.5 | 6.0
Net Investment Income | 189.6 | 168.3 | 140.7
Insurance Claims and Policy- holders’ Benefits | 2,541.7 | 3,141.9 | 3,578.2
Amortization of Deferred Policy Acquisition Costs | 474.1 | 496.2 | 569.8
Other Insurance Expenses | 285.4 | 245.1 | 232.1
Deferred Policy Acquisition Costs | 162.8 | 142.7 |
Insurance Reserves | 2,347.9 | 2,308.7 |
Unearned Premiums | 1,216.8 | 1,104.5 |
Life Insurance | Operating Segments |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 393.9 | 387.6 | 571.5
Other Income (Loss) | 0.5 | (0.2) | (0.6)
Net Investment Income | 170.6 | 193.4 | 216.5
Insurance Claims and Policy- holders’ Benefits | 234.5 | 243.4 | 360.8
Amortization of Deferred Policy Acquisition Costs | 32.6 | 39.9 | 42.4
Other Insurance Expenses | 239.5 | 235.9 | $ 300.9
Deferred Policy Acquisition Costs | 463.1 | 426.9 |
Insurance Reserves | 3,202.4 | 3,425.3 |
Unearned Premiums | $ 8.2 | $ 7.6 |

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