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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Long | Interest Rate Futures |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 1,208,300,000 | $ 1,012,500,000
Long | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 184,200,000 | 172,400,000
Long | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 26,900,000 | 31,300,000
Long | Credit Default Swaps |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 0 | 0
Short | Interest Rate Futures |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 727,900,000 | 1,115,900,000
Short | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 91,400,000 | 101,500,000
Short | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 57,300,000 | 143,400,000
Short | Credit Default Swaps |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 75,200,000 | $ 46,100,000

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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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