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Investments - Schedule of Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 3,637.5  
Unrealized Losses (42.8) $ (117.4)
Fair Value 3,812.6 3,391.6
Fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,637.5 3,477.5
Unrealized Gains 217.9 31.5
Unrealized Losses (42.8) (117.4)
Fair Value 3,812.6 3,391.6
U.S. Government and government agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 17.5 24.7
Unrealized Gains 1.0 0.7
Unrealized Losses 0.0 0.0
Fair Value 18.5 25.4
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 411.4 413.7
Unrealized Gains 31.1 9.6
Unrealized Losses 0.0 (1.4)
Fair Value 442.5 421.9
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 75.9 92.6
Unrealized Gains 4.8 3.1
Unrealized Losses (0.6) (1.3)
Fair Value 80.1 94.4
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 104.0 94.7
Unrealized Gains 2.4 0.3
Unrealized Losses 0.0 (1.1)
Fair Value 106.4 93.9
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 537.2 540.8
Unrealized Gains 1.6 0.8
Unrealized Losses (12.6) (30.1)
Fair Value 526.2 511.5
Corporate and other    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,491.5 2,311.0
Unrealized Gains 177.0 17.0
Unrealized Losses (29.6) (83.5)
Fair Value $ 2,638.9 $ 2,244.5