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Investments - Investment Category and Duration of Gross Unrealized Losses on Fixed Maturity Securities and Equity Securities (Details) - Fixed maturity securities - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, Less than 12 Months, Fair Value $ 366.2 $ 3,524.3
Fixed maturity securities, Less than 12 Months, Unrealized Losses (4.2) (79.4)
Fixed maturity securities, 12 Months or More, Fair Value 321.0 746.4
Fixed maturity securities, 12 Months or More, Unrealized Losses (5.6) (28.9)
Fixed maturity securities, Total, Fair Value 687.2 4,270.7
Fixed maturity securities, Unrealized Losses (9.8) (108.3)
U.S. government and government agencies and authorities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, Less than 12 Months, Fair Value 0.0 11.2
Fixed maturity securities, Less than 12 Months, Unrealized Losses 0.0 (0.1)
Fixed maturity securities, 12 Months or More, Fair Value 46.0 89.5
Fixed maturity securities, 12 Months or More, Unrealized Losses (0.1) (1.1)
Fixed maturity securities, Total, Fair Value 46.0 100.7
Fixed maturity securities, Unrealized Losses (0.1) (1.2)
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, Less than 12 Months, Fair Value   31.5
Fixed maturity securities, Less than 12 Months, Unrealized Losses   (0.1)
Fixed maturity securities, 12 Months or More, Fair Value   3.1
Fixed maturity securities, 12 Months or More, Unrealized Losses   (0.2)
Fixed maturity securities, Total, Fair Value   34.6
Fixed maturity securities, Unrealized Losses   (0.3)
Foreign governments    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, Less than 12 Months, Fair Value 49.7 136.4
Fixed maturity securities, Less than 12 Months, Unrealized Losses (0.1) (2.8)
Fixed maturity securities, 12 Months or More, Fair Value 0.0 9.2
Fixed maturity securities, 12 Months or More, Unrealized Losses 0.0 (0.2)
Fixed maturity securities, Total, Fair Value 49.7 145.6
Fixed maturity securities, Unrealized Losses (0.1) (3.0)
Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, Less than 12 Months, Fair Value 206.5 370.6
Fixed maturity securities, Less than 12 Months, Unrealized Losses (1.9) (9.6)
Fixed maturity securities, 12 Months or More, Fair Value 23.5 0.0
Fixed maturity securities, 12 Months or More, Unrealized Losses (0.3) 0.0
Fixed maturity securities, Total, Fair Value 230.0 370.6
Fixed maturity securities, Unrealized Losses (2.2) (9.6)
Commercial mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, Less than 12 Months, Fair Value 1.8 29.4
Fixed maturity securities, Less than 12 Months, Unrealized Losses (0.1) (0.7)
Fixed maturity securities, 12 Months or More, Fair Value 18.3 12.4
Fixed maturity securities, 12 Months or More, Unrealized Losses (0.7) (0.9)
Fixed maturity securities, Total, Fair Value 20.1 41.8
Fixed maturity securities, Unrealized Losses (0.8) (1.6)
Residential mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, Less than 12 Months, Fair Value 11.5 378.2
Fixed maturity securities, Less than 12 Months, Unrealized Losses (0.1) (3.7)
Fixed maturity securities, 12 Months or More, Fair Value 148.6 309.6
Fixed maturity securities, 12 Months or More, Unrealized Losses (2.0) (11.1)
Fixed maturity securities, Total, Fair Value 160.1 687.8
Fixed maturity securities, Unrealized Losses (2.1) (14.8)
U.S. corporate    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, Less than 12 Months, Fair Value 64.2 1,860.4
Fixed maturity securities, Less than 12 Months, Unrealized Losses (1.6) (49.5)
Fixed maturity securities, 12 Months or More, Fair Value 62.3 173.1
Fixed maturity securities, 12 Months or More, Unrealized Losses (2.1) (10.2)
Fixed maturity securities, Total, Fair Value 126.5 2,033.5
Fixed maturity securities, Unrealized Losses (3.7) (59.7)
Foreign corporate    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, Less than 12 Months, Fair Value 32.5 706.6
Fixed maturity securities, Less than 12 Months, Unrealized Losses (0.4) (12.9)
Fixed maturity securities, 12 Months or More, Fair Value 22.3 149.5
Fixed maturity securities, 12 Months or More, Unrealized Losses (0.4) (5.2)
Fixed maturity securities, Total, Fair Value 54.8 856.1
Fixed maturity securities, Unrealized Losses $ (0.8) $ (18.1)