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Investments in Unconsolidated Affiliates (Symetra) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2011
Investments in unconsolidated affiliates |  |  |  |  |  |  |
Revenues | $ 334.7 | $ 323.2 | $ 1,130.1 | $ 1,048.5 |  |  |
Total expenses | 429.3 | 358.7 | 1,233.3 | 1,011.8 |  |  |
Pre-tax (loss) income | (94.6) | (35.5) | (103.2) | 36.7 |  |  |
Net income | $ (74.9) | 40.1 | 5.5 | 235.1 |  |  |
Symetra |  |  |  |  |  |  |
Investments in unconsolidated affiliates |  |  |  |  |  |  |
Dividends | $ 0.50 |  |  |  |  |  |
Revenues |  |  | $ 1,605.9 | 1,601.6 |  |  |
Stock Repurchased and Retired During Period, Value | 513,500 |  |  |  |  |  |
Shares of Symetra Financial Corporation owned (in shares) | 20,562,379 |  | 20,562,379 |  |  | 20,048,879 |
Ownership interest (as a percent) | 17.70% |  | 17.70% |  |  | 17.31% |
Equity Method Investments Fair Value Per Share |  |  |  |  |  |  | $ 15
Term of amortization (in years) |  |  |  |  | 30 years |  |
Weight Average Years Remaining |  |  | 28 years |  |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 160.8 |  | $ 160.8 |  |  | $ 170.4 |
Total expenses |  |  | 1,543.6 | 1,387.0 |  |  |
Pre-tax (loss) income |  |  | 62.3 | 214.6 |  |  |
Net income |  |  | 89.6 | 186.8 |  |  |
Common Stock | Symetra |  |  |  |  |  |  |
Investments in unconsolidated affiliates |  |  |  |  |  |  |
Proceeds from Equity Method Investment, Dividends or Distributions | $ 12.5 | 2.0 | $ 16.9 | 6.0 |  |  |
Fair value of investment |  |  |  |  |  |  | $ 261.0
Share Price | $ 31.64 |  | $ 31.64 |  |  |  |
equity in earnings of unconsolidated affiliates | Symetra |  |  |  |  |  |  |
Investments in unconsolidated affiliates |  |  |  |  |  |  |
After tax amortization through equity in earnings | $ 0.6 | 0.7 | $ 2.0 | 2.1 |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 32.6 |  | 32.6 |  |  | 36.4 |
Net unrealized gains (losses) of unconsolidated affiliates | Symetra |  |  |  |  |  |  |
Investments in unconsolidated affiliates |  |  |  |  |  |  |
After tax amortization through equity in net unrealized losses | 2.6 | $ 2.9 | 8.1 | $ 8.7 |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 128.2 |  | $ 128.2 |  |  | $ 134.0 |
Expected [Member] | Symetra |  |  |  |  |  |  |
Investments in unconsolidated affiliates |  |  |  |  |  |  |
Dividends Payable, Amount Per Share | $ 32.00 |  | $ 32.00 |  |  |  |
Special Dividend [Member] | Common Stock | Symetra |  |  |  |  |  |  |
Investments in unconsolidated affiliates |  |  |  |  |  |  |
Proceeds from Equity Method Investment, Dividends or Distributions | $ (10.3) |  |  |  |  |  |

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