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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Interest rate swaps | Paying a Fixed Rate | United States of America, Dollars |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 0 | $ 0
Interest rate swaps | Receiving a Fixed Rate | United States of America, Dollars |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0 | 23,500,000
Total return swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0 | 0
Long | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 2,200,000,000 | 2,000,000,000
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 915,000,000 | 700,000,000
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 245,800,000 | 269,500,000
Long | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0 | 0
Long | Equity futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 74,300,000 | 0
Short | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 500,000,000 | 1,000,000,000
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 329,300,000 | 504,200,000
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 131,000,000 | 117,500,000
Short | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 218,500,000 | $ 96,800,000

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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