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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Life | $ 95.4 | $ 95.4 | $ 189.1 | $ 191.1
Earned Premiums, Accident and Health | 43.8 | 39.5 | 87.1 | 78.6
Total Earned Premiums | 658.1 | 582.5 | 1,267.9 | 1,145.9
Personal Automobile [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 416.2 | 339.1 | 787.3 | 659.8
Homeowners [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 62.2 | 66.6 | 124.0 | 132.9
Other Personal Property and Casualty Insurance [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 28.0 | 29.2 | 55.7 | 58.1
Commercial Automobile [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | $ 12.5 | $ 12.7 | $ 24.7 | $ 25.4

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