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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums | $ 1,214.0 | $ 1,206.5 | $ 1,085.3 | $ 1,166.4 | $ 1,145.8 | $ 1,135.2 | $ 1,116.6 | $ 1,074.8 | $ 4,672.2 | $ 4,472.4 | $ 3,384.4
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 3,335.3 | 3,078.4 | 2,027.4
Operating Segments | Specialty Property & Casualty Insurance | Specialty Automobile |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 3,031.3 | 2,825.6 | 1,889.5
Operating Segments | Specialty Property & Casualty Insurance | Commercial Automobile |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 304.0 | 252.8 | 137.9
Operating Segments | Preferred Property & Casualty Insurance |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 688.2 | 750.3 | 730.7
Operating Segments | Preferred Property & Casualty Insurance | Preferred Automobile |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 431.7 | 470.2 | 440.2
Operating Segments | Preferred Property & Casualty Insurance | Homeowners |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 220.7 | 241.3 | 250.1
Operating Segments | Preferred Property & Casualty Insurance | Other Personal Lines |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 35.8 | 38.8 | 40.4
Operating Segments | Life & Health Insurance |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 648.7 | 643.7 | 626.3
Operating Segments | Life & Health Insurance | Life |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 385.7 | 384.6 | 378.4
Operating Segments | Life & Health Insurance | Accident & Health |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 199.3 | 190.9 | 177.5
Operating Segments | Life & Health Insurance | Property |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | $ 63.7 | $ 68.2 | $ 70.4

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