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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
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

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

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- Definition

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+ References

No definition available.

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