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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 2,600,000,000 | $ 1,900,000,000
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 343,000,000.0 | 545,800,000
Interest rate swaps | US Dollars | Paying a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 26,200,000 | 78,400,000
Interest rate swaps | US Dollars | Receiving a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 26,300,000 | 32,100,000
Foreign currency forward contracts, underwriting and non-investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 681,900,000 | 354,100,000
Foreign currency forward contracts, underwriting and non-investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 617,000,000.0 | 601,200,000
Foreign currency forward contracts, investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 105,700,000 | 121,300,000
Foreign currency forward contracts, investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 38,900,000 | 42,900,000
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 0 | 1,000,000.0
Credit default swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | 53,400,000 | $ 126,200,000
Total return swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 100,000,000.0 |
Total return swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | $ 0 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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