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Schedule 2 - Parent Company Financial Statements - Balance Sheets (Non-printing) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Feb. 24, 2015 | Dec. 31, 2014 | Feb. 27, 2014
--- | --- | --- | --- | ---
Amortized Cost of Fixed Maturity Securities | $ 4,560.7 |  | $ 4,341.7 |
Fair Value of Notes Payable | 781.3 |  | 804.4 |
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member] |  |  |  |
Senior Notes Payable, Interest Rate |  | 4.35% |  |
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |  |
Senior Notes Payable, Interest Rate |  |  |  | 7.375%
Parent Company [Member] |  |  |  |
Amortized Cost of Fixed Maturity Securities | 15.1 |  | 12.2 |
Equity Securities at Cost | 11.1 |  | 21.9 |
Parent Company [Member] | Senior Notes [Member] | Senior Notes Payable, 6.00% due 2017 [Member] |  |  |  |
Fair Value of Notes Payable | $ 374.0 |  | $ 390.2 |
Senior Notes Payable, Interest Rate | 6.00% |  | 6.00% |
Parent Company [Member] | Senior Notes [Member] | Senior Notes Payable, 6.00% due 2015 [Member] |  |  |  |
Fair Value of Notes Payable |  |  | $ 260.2 |
Senior Notes Payable, Interest Rate |  |  | 6.00% |
Parent Company [Member] | Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member] |  |  |  |
Fair Value of Notes Payable | $ 248.3 |  | $ 0.0 |
Senior Notes Payable, Interest Rate | 4.35% |  | 4.35% |
Parent Company [Member] | Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member] |  |  |  |
Fair Value of Notes Payable | $ 159.0 |  | $ 154.0 |
Senior Notes Payable, Interest Rate | 7.375% |  | 7.375% |

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