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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Investments in and Advances to Affiliates |  |  |  |  |  |  |  |  |  |  |  |
Total investments | $ 4,280.7 |  |  |  | $ 3,742.4 |  |  |  |  | $ 4,280.7 | $ 3,742.4 |
Total assets | 10,284.5 |  |  |  | 10,455.7 |  |  |  |  | 10,284.5 | 10,455.7 |
Long-term debt | 442.4 |  |  |  | 343.1 |  |  |  |  | 442.4 | 343.1 |
Total liabilities | 5,916.5 |  |  |  | 5,917.3 |  |  |  |  | 5,916.5 | 5,917.3 |
Common shareholders’ equity | 4,368.0 |  |  |  | 4,538.4 |  |  |  |  | 4,368.0 | 4,538.4 |
Earned insurance premiums |  |  |  |  |  |  |  |  |  | 1,188.2 | 1,185.0 | $ 1,120.9
Net investment income |  |  |  |  |  |  |  |  |  | 60.8 | 59.5 | 59.8
Revenues (including realized gains and losses) | 678.5 | $ 334.7 | $ 403.6 | $ 391.8 | 405.6 | $ 323.2 | $ 393.5 | $ 331.8 |  | 1,808.6 | 1,454.1 | 1,361.6
Expenses | $ 420.4 | 429.3 | $ 412.7 | $ 391.3 | 471.3 | $ 358.7 | $ 359.9 | $ 293.2 |  | 1,653.7 | 1,483.1 | 1,203.0
Net income |  |  |  |  |  |  |  |  |  | 279.5 | 290.0 | 309.1
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 197.2 | 207.3 | 247.0
Symetra |  |  |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  | 32,409.2 |  |  | 30,634.3 |  |  |  | $ 32,409.2 |  | 30,634.3 |
Separate account assets |  | 885.9 |  |  | 949.8 |  |  |  | 885.9 |  | 949.8 |
Total assets |  | 34,962.8 |  |  | 33,001.7 |  |  |  | 34,962.8 |  | 33,001.7 |
Policyholder liabilities |  | 29,492.0 |  |  | 27,276.0 |  |  |  | 29,492.0 |  | 27,276.0 |
Long-term debt |  | 697.5 |  |  | 697.2 |  |  |  | 697.5 |  | 697.2 |
Separate account liabilities |  | 885.9 |  |  | 949.8 |  |  |  | 885.9 |  | 949.8 |
Total liabilities |  | 31,836.7 |  |  | 29,641.1 |  |  |  | 31,836.7 |  | 29,641.1 |
Common shareholders’ equity |  | $ 3,126.1 |  |  | $ 3,360.6 |  |  |  | 3,126.1 |  | 3,360.6 |
Earned insurance premiums |  |  |  |  |  |  |  |  | 539.3 |  | 629.1 | 627.2
Net investment income |  |  |  |  |  |  |  |  | 994.3 |  | 1,320.5 | 1,285.0
Revenues (including realized gains and losses) |  |  |  |  |  |  |  |  | 1,605.9 |  | 2,182.4 | 2,139.5
Liability for Future Policy Benefits, Period Expense (Income) |  |  |  |  |  |  |  |  | 1,143.7 |  | 1,399.7 | 1,394.9
Expenses |  |  |  |  |  |  |  |  | 1,543.6 |  | 1,882.5 | 1,865.4
Net income |  |  |  |  |  |  |  |  | 89.6 |  | 254.4 | 220.7
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | $ (234.1) |  | $ 397.0 | $ (777.6)

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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