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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Interest Rate Futures | Long
Derivative [Line Items]
Notional amount	$ 1,100,000,000	$ 1,200,000,000
Interest Rate Futures | Short
Derivative [Line Items]
Notional amount	714,000,000	727,900,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long
Derivative [Line Items]
Notional amount	218,100,000	184,200,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short
Derivative [Line Items]
Notional amount	104,100,000	91,400,000
Foreign Currency Forward Contracts, Investment Operations | Long
Derivative [Line Items]
Notional amount	20,100,000	26,900,000
Foreign Currency Forward Contracts, Investment Operations | Short
Derivative [Line Items]
Notional amount	5,100,000	57,300,000
Credit Default Swaps | Long
Derivative [Line Items]
Notional amount	30,000,000	0
Credit Default Swaps | Short
Derivative [Line Items]
Notional amount	$ 36,400,000	$ 75,200,000

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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- Definition

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+ References

No definition available.

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