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Investments - Schedule of Major Industry Types of Fixed Maturity Holdings (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 3,637.5 |
Fair Value | 3,812.6 | $ 3,391.6
Corporate And Other Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,491.5 | 2,311.0
Fair Value | $ 2,638.9 | $ 2,244.5
Percentage of Total | 100.00% | 100.00%
Corporate And Other Fixed Maturities | Finance, insurance, and real estate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 550.1 | $ 469.0
Fair Value | $ 569.3 | $ 452.9
Percentage of Total | 21.60% | 20.20%
Corporate And Other Fixed Maturities | Transportation, communications, electric, gas and sanitary services |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 768.7 | $ 758.6
Fair Value | $ 808.4 | $ 734.0
Percentage of Total | 30.60% | 32.70%
Corporate And Other Fixed Maturities | Manufacturing |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 731.0 | $ 712.7
Fair Value | $ 788.2 | $ 693.5
Percentage of Total | 29.90% | 30.90%
Corporate And Other Fixed Maturities | Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 441.7 | $ 370.7
Fair Value | $ 473.0 | $ 364.1
Percentage of Total | 17.90% | 16.20%

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