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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