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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums | $ 1,063.6 | $ 1,052.9 | $ 658.1 | $ 609.8 | $ 605.9 | $ 598.2 | $ 582.5 | $ 563.4 | $ 3,384.4 | $ 2,350.0 | $ 2,220.0
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 3,384.4 | 2,350.0 | 2,220.0
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 730.7 | 730.3 | 741.5
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] | Homeowners [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 250.1 |  | 271.9
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] | Other Personal Lines [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 40.4 | 42.7 | 45.0
Operating Segments [Member] | Specialty Property & Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 2,027.4 | 1,005.7 | 873.3
Operating Segments [Member] | Specialty Property & Casualty Insurance [Member] | Specialty Automobile [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 1,889.5 | 954.3 | 820.0
Operating Segments [Member] | Specialty Property & Casualty Insurance [Member] | Commercial Automobile [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 137.9 | 51.4 | 53.3
Operating Segments [Member] | Life and Health Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 626.3 | 614.0 | 605.2
Operating Segments [Member] | Life and Health Insurance [Member] | Life [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 378.4 | 379.7 | 381.6
Operating Segments [Member] | Life and Health Insurance [Member] | Accidental and Health [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 177.5 | 161.7 | 149.4
Operating Segments [Member] | Life and Health Insurance [Member] | Property [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 70.4 | 72.6 | 74.2
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] | Preferred Automobile [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | $ 440.2 | 422.8 | $ 424.6
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] | Homeowners [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  |  | $ 264.8 |

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