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Schedule 3 - Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | $ 4,672.2 | $ 4,472.4 | $ 3,384.4
Other Income | 94.6 | 35.5 | 42.2
Net Investment Income | 348.2 | 364.3 | 340.9
Insurance Claims and Policy- holders’ Benefits | 3,323.6 | 3,188.3 | 2,466.5
Amortization of Deferred Policy Acquisition Costs | 641.8 | 408.3 | 377.1
Other Insurance Expenses | 458.7 | 611.4 | 540.5
Deferred Policy Acquisition Costs | 589.3 | 537.7 |
Insurance Reserves | 5,510.0 | 5,471.8 |
Unearned Premiums | 1,615.1 | 1,545.5 |
Specialty Property & Casualty Insurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 3,335.3 | 3,078.4 | 2,027.4
Premiums Written | 3,435.5 | 3,211.3 | 2,067.4
Other Income | 1.8 | 7.0 | 2.4
Net Investment Income | 114.1 | 107.5 | 63.4
Insurance Claims and Policy- holders’ Benefits | 2,378.4 | 2,278.9 | 1,523.8
Amortization of Deferred Policy Acquisition Costs | 497.5 | 224.9 | 202.0
Other Insurance Expenses | 154.4 | 330.7 | 219.7
Deferred Policy Acquisition Costs | 177.4 | 161.6 |
Insurance Reserves | 1,544.8 | 1,551.0 |
Unearned Premiums | 1,262.9 | 1,158.0 |
Preferred Property & Casualty Insurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 688.2 | 750.3 | 730.7
Premiums Written | 653.0 | 739.3 | 748.8
Other Income | 0.1 | 0.0 | 0.0
Net Investment Income | 37.7 | 44.1 | 61.8
Insurance Claims and Policy- holders’ Benefits | 503.1 | 508.8 | 538.4
Amortization of Deferred Policy Acquisition Costs | 111.2 | 120.1 | 117.2
Other Insurance Expenses | 109.9 | 113.2 | 108.3
Deferred Policy Acquisition Costs | 51.2 | 57.7 |
Insurance Reserves | 411.6 | 388.5 |
Unearned Premiums | 329.2 | 363.4 |
Life & Health Insurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 648.7 | 643.7 | 626.3
Other Income | 0.6 | 8.5 | 4.0
Net Investment Income | 198.8 | 206.4 | 210.9
Insurance Claims and Policy- holders’ Benefits | 442.0 | 402.7 | 404.2
Amortization of Deferred Policy Acquisition Costs | 33.1 | 63.3 | 57.9
Other Insurance Expenses | 301.8 | 270.7 | 263.2
Deferred Policy Acquisition Costs | 360.7 | 318.4 |
Insurance Reserves | 3,532.1 | 3,505.3 |
Unearned Premiums | 23.0 | 24.1 |
Other |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 0.0 | 0.0 | 0.0
Other Income | 92.1 | 20.0 | 35.8
Net Investment Income | (2.4) | 6.3 | 4.8
Insurance Claims and Policy- holders’ Benefits | 0.1 | (2.1) | 0.1
Amortization of Deferred Policy Acquisition Costs | 0.0 | 0.0 | 0.0
Other Insurance Expenses | (107.4) | (103.2) | $ (50.7)
Deferred Policy Acquisition Costs | 0.0 | 0.0 |
Insurance Reserves | 21.5 | 27.0 |
Unearned Premiums | $ 0.0 | $ 0.0 |

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