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Investments in Unconsolidated Affiliates (Financial Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 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 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Investments in and Advances to Affiliates |  |  |  |  |  |  |  |  |  |  |  |
Total investments | $ 5,334.8 |  |  |  | $ 4,271.1 |  |  |  |  | $ 5,334.8 | $ 4,271.1 |
Total assets | 6,544.7 |  |  |  | 10,282.6 |  |  |  |  | 6,544.7 | 10,282.6 |
Long-term debt | 285.9 |  |  |  | 337.6 |  |  |  |  | 285.9 | 337.6 |
Total liabilities | 2,807.5 |  |  |  | 5,914.6 |  |  |  |  | 2,807.5 | 5,914.6 |
Common shareholders’ equity | 3,737.2 |  |  |  | 4,368.0 |  |  |  |  | 3,737.2 | 4,368.0 |
Earned insurance premiums |  |  |  |  |  |  |  |  |  | 1,114.0 | 1,188.2 | $ 1,185.0
Net investment income |  |  |  |  |  |  |  |  |  | 86.8 | 60.8 | 59.5
(Loss) revenues (including realized gains and losses) | 268.2 | $ 365.0 | $ 358.2 | $ 369.3 | 602.6 | $ 296.1 | $ 368.7 | $ 354.3 |  | 1,360.7 | 1,621.7 | 1,411.1
Expenses | $ 335.0 | $ 345.0 | $ 360.3 | $ 360.8 | $ 356.3 | 383.0 | $ 373.8 | $ 351.3 |  | 1,401.1 | 1,464.4 | 1,440.5
Net income |  |  |  |  |  |  |  |  |  | 419.8 | 279.5 | 290.0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 558.1 | $ 197.2 | 207.3
Symetra |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  |  |  |  |  | 32,409.2 |  |  | $ 32,409.2 |  |  |
Separate account assets |  |  |  |  |  | 885.9 |  |  | 885.9 |  |  |
Total assets |  |  |  |  |  | 34,962.8 |  |  | 34,962.8 |  |  |
Policyholder liabilities |  |  |  |  |  | 29,492.0 |  |  | 29,492.0 |  |  |
Long-term debt |  |  |  |  |  | 697.5 |  |  | 697.5 |  |  |
Separate account liabilities |  |  |  |  |  | 885.9 |  |  | 885.9 |  |  |
Total liabilities |  |  |  |  |  | 31,836.7 |  |  | 31,836.7 |  |  |
Common shareholders’ equity |  |  |  |  |  | $ 3,126.1 |  |  | 3,126.1 |  |  |
Earned insurance premiums |  |  |  |  |  |  |  |  | 539.3 |  |  | 629.1
Net investment income |  |  |  |  |  |  |  |  | 994.3 |  |  | 1,320.5
(Loss) revenues (including realized gains and losses) |  |  |  |  |  |  |  |  | 1,605.9 |  |  | 2,182.4
Liability for Future Policy Benefits, Period Expense (Income) |  |  |  |  |  |  |  |  | 1,143.7 |  |  | 1,399.7
Expenses |  |  |  |  |  |  |  |  | 1,543.6 |  |  | 1,882.5
Net income |  |  |  |  |  |  |  |  | 89.6 |  |  | 254.4
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | $ (234.1) |  |  | $ 397.0

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