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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Interest rate swaps | Paying a Fixed Rate | United States of America, Dollars |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 27,900,000 | $ 78,400,000
Interest rate swaps | Receiving a Fixed Rate | United States of America, Dollars |  |
Derivative [Line Items] |  |
Derivative, notional amount | 25,500,000 | 32,100,000
Long | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 2,500,000,000 | 1,900,000,000
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 722,600,000 | 354,100,000
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 195,600,000 | 121,300,000
Long | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 500,000 | 1,000,000.0
Long | Total return swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 173,500,000 |
Long | Equity futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 122,000,000.0 | 44,700,000
Short | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,000,000,000.0 | 545,800,000
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,200,000,000 | 601,200,000
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 61,000,000.0 | 42,900,000
Short | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 143,400,000 | 126,200,000
Short | Total return swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0 |
Short | Equity futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 0 | $ 0

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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=109980867&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=109980867&loc=SL5579245-113959 + Details
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