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Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Interest Rate Contracts | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 2,321.8 | $ 1,169.3
Interest Rate Contracts | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 813.7 | 356.6
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 330.2 | 263.6
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 311.7 | 139.8
Foreign Currency Forward Contracts, Investment Operations | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 39.5 | 39.6
Foreign Currency Forward Contracts, Investment Operations | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 145.5 | 159.1
Credit Default Swaps | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1.1 | 7.1
Credit Default Swaps | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 19.8 | 18.4
Weather Contract | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 6.6 | $ 6.4

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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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