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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Long | Interest rate futures
Derivative [Line Items]
Derivative notional amount	$ 1,500,000,000	$ 1,200,000,000
Long | Foreign currency forward contracts, underwriting and non-investment operations
Derivative [Line Items]
Derivative notional amount	215,400,000	184,200,000
Long | Foreign currency forward contracts, investment operations
Derivative [Line Items]
Derivative notional amount	16,600,000	26,900,000
Long | Credit default swaps
Derivative [Line Items]
Derivative notional amount	1,000,000	0
Short | Interest rate futures
Derivative [Line Items]
Derivative notional amount	801,100,000	727,900,000
Short | Foreign currency forward contracts, underwriting and non-investment operations
Derivative [Line Items]
Derivative notional amount	44,200,000	91,400,000
Short | Foreign currency forward contracts, investment operations
Derivative [Line Items]
Derivative notional amount	5,100,000	57,300,000
Short | Credit default swaps
Derivative [Line Items]
Derivative notional amount	18,800,000	$ 75,200,000
Paying a Fixed Rate | United States of America, Dollars | Interest rate swaps
Derivative [Line Items]
Derivative notional amount	40,300,000
Receiving a Fixed Rate | United States of America, Dollars | Interest rate swaps
Derivative [Line Items]
Derivative notional amount	$ 0

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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