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v3.19.3.a.u2

Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums | $ 1,145.8 | $ 1,135.2 | $ 1,116.6 | $ 1,074.8 | $ 1,063.6 | $ 1,052.9 | $ 658.1 | $ 609.8 | $ 4,472.4 | $ 3,384.4 | $ 2,350.0
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 3,078.4 | 2,027.4 | 1,005.7
Operating Segments | Specialty Property & Casualty Insurance | Specialty Automobile |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 2,825.6 | 1,889.5 | 954.3
Operating Segments | Specialty Property & Casualty Insurance | Commercial Automobile |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 252.8 | 137.9 | 51.4
Operating Segments | Preferred Property & Casualty Insurance |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 750.3 | 730.7 | 730.3
Operating Segments | Preferred Property & Casualty Insurance | Preferred Automobile |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 470.2 | 440.2 | 422.8
Operating Segments | Preferred Property & Casualty Insurance | Homeowners |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 241.3 | 250.1 | 264.8
Operating Segments | Preferred Property & Casualty Insurance | Other Personal Lines |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 38.8 | 40.4 | 42.7
Operating Segments | Life & Health Insurance |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 643.7 | 626.3 | 614.0
Operating Segments | Life & Health Insurance | Life |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 384.6 | 378.4 | 379.7
Operating Segments | Life & Health Insurance | Accident & Health |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 190.9 | 177.5 | 161.7
Operating Segments | Life & Health Insurance | Property |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | $ 68.2 | $ 70.4 | $ 72.6

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