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Business Dispositions and Discontinued Operations - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2018 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Long-term Debt |  |  | $ 4,352.0 | $ 4,348.0 |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  | (48.0) | 0.0 | $ 202.0
Income tax expense |  |  | 383.0 | 475.0 | 268.0
Life and Annuity Run-Off Business |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income (Loss) from Ongoing Equity Method Investment in Discontinued Operation after Disposal |  |  | 42.0 | 66.0 |
Discontinued Operation, Amount of Continuing Cash Flows after Disposal |  |  | 30.0 | $ 67.0 |
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] |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  | $ (193.0) |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Life and Annuity Run-Off Business |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash proceeds from sale of business | $ 1,400.0 |  |  |  |
Dividends paid | $ 300.0 |  |  |  |
Ownership interest retained, percentage | 9.70% |  |  |  |
Ownership interest retained | $ 164.0 |  |  |  |
Long-term Debt | 142.0 |  |  |  |
Consideration received | 1,500.0 |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  |  | 202.0
Adjustments to AOCI | $ 758.0 | 758.0 |  |  | 758.0
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Life and Annuity Run-Off Business | 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
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Life and Annuity Run-Off Business | Operating Income (Loss) [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
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Life and Annuity Run-Off Business | Other Income [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 |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Life and Annuity Run-Off Business | Equity [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) |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Life and Annuity Run-Off Business | Deferred Tax Asset [Domain] |  |  |  |  |
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)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Continental Europe Operations [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Consideration received |  |  | 14.0 |  |
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax |  |  | 30.0 |  |
Business Combination, Contingent Consideration, Liability |  |  | 12.0 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Continental Europe Operations [Member] | Interest rate swaps |  |  |  |  |
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 |  |  | 48.0 |  |
Income tax expense |  |  | $ 18.0 |  |

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