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Income From Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Equity Method Limited Liability Investments |  |  |  |  |  |  |  |  | $ 24.8 | $ 7.5 | $ 19.0
Fair Value Option Investments |  |  |  |  |  |  |  |  | 1.3 | (1.9) | 0.2
Investment Income, Limited Liability Investments Included in Equity Securities |  |  |  |  |  |  |  |  | 28.6 | 22.0 | 17.6
Investment Income, Alternative Investments |  |  |  |  |  |  |  |  | 54.7 | 27.6 | 36.8
Real Estate |  |  |  |  |  |  |  |  | 10.7 | 11.8 | 11.9
Total Investment Income |  |  |  |  |  |  |  |  | 345.0 | 316.3 | 321.2
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 17.8 | 18.0 | 18.6
Net Investment Income | $ 82.6 | $ 85.9 | $ 77.1 | $ 81.6 | $ 79.9 | $ 77.7 | $ 73.7 | $ 67.0 | 327.2 | 298.3 | 302.6
Accrued Investment Income Receivable | $ 72.8 |  |  |  | $ 70.8 |  |  |  | 72.8 | 70.8 |
Real Estate Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 10.5 | 11.0 | 11.3
Other Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 7.3 | 7.0 | 7.3
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | 246.6 | 242.7 | 236.2
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | 9.3 | 11.8 | 14.8
Short-term Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | 1.6 | 0.5 | 0.4
Policy Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | 21.6 | 21.6 | 21.1
Other Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | $ 0.5 | $ 0.3 | $ 0.0

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