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Investments (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) item
Investment [Line Items] |  |  |  |  |
Increase (decrease) in gross AFS securities unrealized losses |  |  | $ 1,500.0 |  |
Portion of loss recognized in other comprehensive income |  | $ 1.0 |  | $ 1.0 |
Number of partnerships in alternative investment portfolio | item | 239 |  | 239 |  | 224
Alternative investments as a percentage of overall invested assets |  |  | 1.00% |  | 1.00%
Fair value of collateral received that we are permitted to sell or re-pledge | $ 528.0 |  | $ 528.0 |  |
Securities that have been re-pledged | 502.0 |  | 502.0 |  |
Investment commitments | 1,500.0 |  | 1,500.0 |  |
Investment commitments for limited partnerships | 815.0 |  | 815.0 |  |
Investment commitments for mortgage loans on real estate | 379.0 |  | 379.0 |  |
Investment commitments for private placements | 334.0 |  | 334.0 |  |
Maximum [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Portion of loss recognized in other comprehensive income | 1.0 |  | 1.0 |  |
Federal Home Loan Mortgage Corporation [Member] | Invested Assets [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Fair value | 1,400.0 |  | $ 1,400.0 |  | $ 1,300.0
Concentration risk, percentage |  |  | 1.00% |  | 1.00%
Federal National Mortgage Association [Member] | Invested Assets [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Fair value | 1,200.0 |  | $ 1,200.0 |  | $ 1,000.0
Concentration risk, percentage |  |  | 1.00% |  | 1.00%
Consumer Non-Cyclical Industry [Member] | Invested Assets [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Fair value | 14.5 |  | $ 14.5 |  | $ 15.0
Concentration risk, percentage |  |  | 13.00% |  | 13.00%
Financial Service [Member] | Invested Assets [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Fair value | $ 13.7 |  | $ 13.7 |  |
Concentration risk, percentage |  |  | 12.00% |  |
Utilities Industry [Member] | Invested Assets [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Fair value |  |  |  |  | $ 14.3
Concentration risk, percentage |  |  |  |  | 13.00%
Mortgage Loans On Real Estate [Member] | Geographic Concentration Risk [Member] | California [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 22.00% |  | 21.00%
Mortgage Loans On Real Estate [Member] | Geographic Concentration Risk [Member] | Texas [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 12.00% |  | 12.00%
Corporate Bonds [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Percentage of fair value rated as investment grade | 96.00% |  | 96.00% |  | 96.00%
Amortized cost of portfolio rated below investment grade | $ 3,200.0 |  | $ 3,200.0 |  | $ 3,500.0
Fair value of portfolio rated below investment grade | $ 3,100.0 |  | $ 3,100.0 |  | $ 3,500.0
ABS [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Percentage of fair value rated as investment grade | 98.00% |  | 98.00% |  | 98.00%
Amortized cost of portfolio rated below investment grade | $ 46.0 |  | $ 46.0 |  | $ 46.0
Fair value of portfolio rated below investment grade | $ 43.0 |  | $ 43.0 |  | $ 43.0
MBS [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Projected default rate on existing delinquencies on MBS (low end of range) | 10.00% |  | 10.00% |  | 10.00%
Projected default rate on existing delinquencies on MBS (high end of range) | 100.00% |  | 100.00% |  | 100.00%
Severity of second lien loans | 100.00% |  | 100.00% |  | 100.00%
Severity of first lien loans | 30.00% |  | 30.00% |  | 30.00%

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