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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 1,600,000,000 | $ 1,500,000,000
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 699,000,000 | 801,100,000
Interest rate swaps | US Dollars | Paying a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 62,600,000 | 40,300,000
Interest rate swaps | US Dollars | Receiving a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 29,500,000 | 0
Foreign currency forward contracts, underwriting and non-investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 354,400,000 | 215,400,000
Foreign currency forward contracts, underwriting and non-investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 536,400,000 | 44,200,000
Foreign currency forward contracts, investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 109,000,000 | 16,600,000
Foreign currency forward contracts, investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 62,400,000 | 5,100,000
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 1,000,000 | 1,000,000
Credit default swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | $ 109,700,000 | $ 18,800,000

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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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