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Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
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

X

- 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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- Details

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