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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Long | Interest Rate Futures |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 1,012.5 | $ 587.0
Long | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 172.4 | 144.8
Long | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 31.3 | 35.8
Long | Credit Default Swaps |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 0.0 | 4.6
Short | Interest Rate Futures |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,115.9 | 617.4
Short | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 101.5 | 121.6
Short | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 143.4 | 150.1
Short | Credit Default Swaps |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 46.1 | 19.4
Short | Weather Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount |  | $ 2.2

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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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