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Schedule 3 - Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | $ 5,253.7 | $ 4,672.2 | $ 4,472.4
Other Income | 4.8 | 94.6 | 35.5
Net Investment Income | 427.3 | 348.2 | 364.3
Insurance Claims and Policy- holders’ Benefits | 4,600.8 | 3,323.6 | 3,188.3
Amortization of Deferred Policy Acquisition Costs | 684.3 | 641.8 | 408.3
Other Insurance Expenses | 533.8 | 458.7 | 611.4
Deferred Policy Acquisition Costs | 677.6 | 589.3 |
Insurance Reserves | 6,313.6 | 5,510.0 |
Unearned Premiums | 1,898.7 | 1,615.1 |
Specialty Property & Casualty Insurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 3,948.5 | 3,335.3 | 3,078.4
Premiums Written | 4,057.3 | 3,435.5 | 3,211.3
Other Income | 4.1 | 1.8 | 7.0
Net Investment Income | 152.5 | 114.1 | 107.5
Insurance Claims and Policy- holders’ Benefits | 3,593.7 | 2,378.4 | 2,278.9
Amortization of Deferred Policy Acquisition Costs | 546.7 | 497.5 | 224.9
Other Insurance Expenses | 227.8 | 154.4 | 330.7
Deferred Policy Acquisition Costs | 219.0 | 177.4 |
Insurance Reserves | 2,319.7 | 1,544.8 |
Unearned Premiums | 1,545.9 | 1,262.9 |
Preferred Property & Casualty Insurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 651.7 | 688.2 | 750.3
Premiums Written | 642.0 | 653.0 | 739.3
Other Income | 0.0 | 0.1 | 0.0
Net Investment Income | 68.6 | 37.7 | 44.1
Insurance Claims and Policy- holders’ Benefits | 537.4 | 503.1 | 508.8
Amortization of Deferred Policy Acquisition Costs | 103.8 | 111.2 | 120.1
Other Insurance Expenses | 102.6 | 109.9 | 113.2
Deferred Policy Acquisition Costs | 49.2 | 51.2 |
Insurance Reserves | 433.2 | 411.6 |
Unearned Premiums | 331.6 | 329.2 |
Life & Health Insurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 653.5 | 648.7 | 643.7
Other Income | (1.3) | 0.6 | 8.5
Net Investment Income | 202.7 | 198.8 | 206.4
Insurance Claims and Policy- holders’ Benefits | 469.7 | 442.0 | 402.7
Amortization of Deferred Policy Acquisition Costs | 33.8 | 33.1 | 63.3
Other Insurance Expenses | 325.1 | 301.8 | 270.7
Deferred Policy Acquisition Costs | 409.4 | 360.7 |
Insurance Reserves | 3,544.5 | 3,532.1 |
Unearned Premiums | 21.2 | 23.0 |
Other |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Earned Premiums | 0.0 | 0.0 | 0.0
Other Income | 2.0 | 92.1 | 20.0
Net Investment Income | 3.5 | (2.4) | 6.3
Insurance Claims and Policy- holders’ Benefits | 0.0 | 0.1 | (2.1)
Amortization of Deferred Policy Acquisition Costs | 0.0 | 0.0 | 0.0
Other Insurance Expenses | (121.7) | (107.4) | $ (103.2)
Deferred Policy Acquisition Costs | 0.0 | 0.0 |
Insurance Reserves | 16.2 | 21.5 |
Unearned Premiums | $ 0.0 | $ 0.0 |

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