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Business Dispositions and Discontinued Operations - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2018 | May 11, 2017 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Long-term Debt |  |  |  | $ 4,265.0 | $ 4,678.0 |  |
Loss on discontinued operations |  |  |  | (202.0) | 3,257.0 | $ 81.0 |
Income (Loss) from Ongoing Equity Method Investment in Discontinued Operation after Disposal |  |  |  | 8.0 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | P&C Runoff Subsidiaries |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash proceeds from sale of business |  | $ 272.0 |  |  |  |  |
Capital loss from transaction |  | $ (5.0) |  |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash proceeds from sale of business | $ 1.4 |  |  |  |  |  |
Dividends paid | $ 300.0 |  |  |  |  |  |
Ownership interest retained, percentage | 9.70% |  |  |  |  |  |
Ownership interest retained | $ 164.0 |  |  |  |  |  |
Long-term Debt | 142.0 |  |  |  | 142.0 |  |
Consideration received | 1,500.0 |  |  |  |  |  |
Loss on discontinued operations |  |  |  |  | 3,300.0 |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  | 202.0 | (3,257.0) | $ 0.0 |
Adjustments to AOCI | $ 758.0 |  |  |  | $ 1,000.0 |  | $ 758.0
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Shadow DAC [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  | 10.0 |  |  |
Equity [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  | $ (193.0) |  |  |  |
Deferred Tax Asset [Domain] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  | (141.0) |  |  |
Operating Income (Loss) [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  | $ 104.0 |  |  |
Other Income [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Minimum |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Period of Continuing Involvement after Disposal | 5 years |  |  |  |  |  |
Other Income [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Maximum |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Period of Continuing Involvement after Disposal | 24 months |  |  |  |  |  |

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