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Schedule 2 - Parent Company Financial Statements - Balance Sheets (Non-printing) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 24, 2015 | Feb. 27, 2014
--- | --- | --- | --- | ---
Amortized Cost of Fixed Maturity Securities | $ 6,284.5 | $ 5,021.6 |  |
Senior Notes [Member] | Senior Notes Payable, 6.00% due 2015 [Member] |  |  |  |
Stated interest rate, percentage |  |  | 6.00% |
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member] |  |  |  |
Stated interest rate, percentage |  |  | 4.35% |
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |  |
Stated interest rate, percentage |  |  |  | 7.375%
Parent Company [Member] |  |  |  |
Amortized Cost of Fixed Maturity Securities | 12.6 | 0.3 |  |
Parent Company [Member] | Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member] |  |  |  |
Fair Value of Notes Payable | $ 444.2 | $ 458.1 |  |
Stated interest rate, percentage | 4.35% | 4.35% |  |
Parent Company [Member] | Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |  |
Fair Value of Notes Payable | $ 151.1 | $ 156.5 |  |
Stated interest rate, percentage | 7.375% | 7.375% |  |
Parent Company [Member] | Subordinated Debt [Member] | Term Loan Due 2020 [Member] |  |  |  |
Fair Value of Notes Payable | $ 35.0 | $ 0.0 |  |

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