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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Life | $ 95.2 | $ 94.5 | $ 284.3 | $ 285.6
Earned Premiums, Accident and Health | 44.9 | 42.0 | 132.0 | 120.6
Total Earned Premiums | 1,052.9 | 598.2 | 2,320.8 | 1,744.1
Personal Automobile [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 766.7 | 353.0 | 1,554.0 | 1,012.8
Homeowners [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 62.5 | 66.7 | 186.5 | 199.6
Other Personal Property and Casualty Insurance [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 27.7 | 28.9 | 83.4 | 87.0
Commercial Automobile [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | $ 55.9 | $ 13.1 | $ 80.6 | $ 38.5

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