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Investments (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) security item | Dec. 31, 2018 USD ($) security item
Investment [Line Items] |  |
Increase (decrease) in gross AFS securities unrealized losses | $ (1,500.0) |
Number of partnerships in alternative investment portfolio | item | 246 | 237
Alternative investments as a percentage of overall invested assets | 2.00% | 1.00%
Fair value of collateral received that we are permitted to sell or re-pledge | $ 548.0 |
Securities that have been re-pledged | 536.0 |
Investment commitments | 2,000.0 |
Investment commitments for limited partnerships | 823.0 |
Investment commitments for mortgage loans on real estate | 669.0 |
Investment commitments for private placements | $ 528.0 |
Commercial [Member] |  |
Investment [Line Items] |  |
Number of impaired loans | security | 0 | 0
Residential [Member] |  |
Investment [Line Items] |  |
Number of impaired loans | security | 0 | 0
Impaired financing receivable, allowance | $ 1.0 |
Maximum [Member] | Residential [Member] |  |
Investment [Line Items] |  |
Impaired financing receivable, allowance |  | $ 1.0
Federal Home Loan Mortgage Corporation [Member] | Invested Assets [Member] |  |
Investment [Line Items] |  |
Fair value | $ 1,400.0 | $ 1,400.0
Concentration risk, percentage | 1.00% | 1.00%
Federal National Mortgage Association [Member] | Invested Assets [Member] |  |
Investment [Line Items] |  |
Fair value | $ 1,300.0 | $ 1,300.0
Concentration risk, percentage | 1.00% | 1.00%
Consumer Non-Cyclical Industry [Member] | Invested Assets [Member] |  |
Investment [Line Items] |  |
Fair value | $ 15.1 | $ 14.5
Concentration risk, percentage | 12.00% | 13.00%
Financial Service [Member] | Invested Assets [Member] |  |
Investment [Line Items] |  |
Fair value | $ 15.3 | $ 14.2
Concentration risk, percentage | 13.00% | 12.00%
Mortgage Loans On Real Estate [Member] | Geographic Concentration Risk [Member] | California [Member] | Commercial [Member] |  |
Investment [Line Items] |  |
Concentration risk, percentage | 23.00% | 23.00%
Mortgage Loans On Real Estate [Member] | Geographic Concentration Risk [Member] | California [Member] | Residential [Member] |  |
Investment [Line Items] |  |
Concentration risk, percentage | 30.00% | 34.00%
Mortgage Loans On Real Estate [Member] | Geographic Concentration Risk [Member] | Texas [Member] | Commercial [Member] |  |
Investment [Line Items] |  |
Concentration risk, percentage | 12.00% | 12.00%
Mortgage Loans On Real Estate [Member] | Geographic Concentration Risk [Member] | Florida [Member] | Residential [Member] |  |
Investment [Line Items] |  |
Concentration risk, percentage | 19.00% | 19.00%
Corporate Bonds [Member] |  |
Investment [Line Items] |  |
Percentage of fair value rated as investment grade | 96.00% | 96.00%
Amortized cost of portfolio rated below investment grade | $ 3,300.0 | $ 3,200.0
Fair value of portfolio rated below investment grade | $ 3,200.0 | $ 3,000.0
MBS [Member] |  |
Investment [Line Items] |  |
Severity of second lien loans | 100.00% | 100.00%
Severity of first lien loans | 30.00% | 30.00%

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