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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Interest rate swaps | Paying a Fixed Rate | United States of America, Dollars |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 78,400,000 | $ 40,300,000
Interest rate swaps | Receiving a Fixed Rate | United States of America, Dollars |  |
Derivative [Line Items] |  |
Derivative notional amount | 32,100,000 | 0
Long | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative notional amount | 1,900,000,000 | 1,500,000,000
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | 354,100,000 | 215,400,000
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | 121,300,000 | 16,600,000
Long | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative notional amount | 1,000,000 | 1,000,000
Short | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative notional amount | 545,800,000 | 801,100,000
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | 601,200,000 | 44,200,000
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | 42,900,000 | 5,100,000
Short | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 126,200,000 | $ 18,800,000

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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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