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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 1,100,000,000 | $ 1,200,000,000
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 399,700,000 | 727,900,000
Interest rate swaps | Paying a Fixed Rate | US Dollars |  |
Derivative [Line Items] |  |
Notional amount | 51,300,000 |
Interest rate swaps | Receiving a Fixed Rate | US Dollars |  |
Derivative [Line Items] |  |
Notional amount | 5,300,000 |
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 191,100,000 | 184,200,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 68,500,000 | 91,400,000
Foreign Currency Forward Contracts, Investment Operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 17,600,000 | 26,900,000
Foreign Currency Forward Contracts, Investment Operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 4,500,000 | 57,300,000
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 15,500,000 | 0
Credit default swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | $ 13,300,000 | $ 75,200,000

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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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