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Income From Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Equity Method Limited Liability Investments |  |  |  |  |  |  |  |  | $ 19.0 | $ 9.0 | $ 26.4
Fair Value Option Investments |  |  |  |  |  |  |  |  | 0.2 | (0.7) | 0.0
Short-term Investments |  |  |  |  |  |  |  |  | 0.4 | 0.6 | 0.1
Real Estate |  |  |  |  |  |  |  |  | 11.9 | 12.1 | 20.8
Loans to Policyholders |  |  |  |  |  |  |  |  | 21.1 | 20.5 | 19.8
Other |  |  |  |  |  |  |  |  | 0.0 | 0.1 | 0.0
Total Investment Income |  |  |  |  |  |  |  |  | 321.2 | 328.9 | 340.6
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 18.6 | 19.8 | 25.9
Net Investment Income | $ 79.4 | $ 75.9 | $ 76.7 | $ 70.6 | $ 93.1 | $ 72.3 | $ 72.6 | $ 71.1 | 302.6 | 309.1 | 314.7
Accrued Investment Income Receivable | $ 68.5 |  |  |  | $ 65.5 |  |  |  | 68.5 | 65.5 |
Real Estate Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 11.3 | 11.3 | 18.3
Other Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 7.3 | 8.5 | 7.6
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | 236.2 | 227.4 | 235.5
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Dividends on Equity Securities |  |  |  |  |  |  |  |  | $ 32.4 | $ 59.9 | $ 38.0

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