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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