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Income From Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Equity Method Limited Liability Investments |  |  |  |  |  |  |  |  | $ 7.5 | $ 19.0 | $ 9.0
Fair Value Option Investments |  |  |  |  |  |  |  |  | (1.9) | 0.2 | (0.7)
Investment Income, Limited Liability Investments Included in Equity Securities |  |  |  |  |  |  |  |  | 22.0 | 17.6 | 40.7
Investment Income, Alternative Investments |  |  |  |  |  |  |  |  | 27.6 | 36.8 | 49.0
Real Estate |  |  |  |  |  |  |  |  | 11.8 | 11.9 | 12.1
Total Investment Income |  |  |  |  |  |  |  |  | 316.3 | 321.2 | 328.9
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 18.0 | 18.6 | 19.8
Net Investment Income | $ 79.9 | $ 77.7 | $ 73.7 | $ 67.0 | $ 79.4 | $ 75.9 | $ 76.7 | $ 70.6 | 298.3 | 302.6 | 309.1
Accrued Investment Income Receivable | $ 70.8 |  |  |  | $ 68.5 |  |  |  | 70.8 | 68.5 |
Real Estate Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 11.0 | 11.3 | 11.3
Other Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 7.0 | 7.3 | 8.5
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | 242.7 | 236.2 | 227.4
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | 11.8 | 14.8 | 19.2
Short-term Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | 0.5 | 0.4 | 0.6
Policy Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | 21.6 | 21.1 | 20.5
Other Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | $ 0.3 | $ 0.0 | $ 0.1

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