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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Interest rate swaps | Paying a Fixed Rate | United States of America, Dollars |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 0.0 | $ 27.9
Interest rate swaps | Receiving a Fixed Rate | United States of America, Dollars |  |
Derivative [Line Items] |  |
Derivative, notional amount | 23.5 | 25.5
Long | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 2,000.0 | 2,500.0
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 661.4 | 1,200.0
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 269.5 | 195.6
Long | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.5
Long | Total return swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 173.5
Long | Equity futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 122.0
Short | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,000.0 | 1,000.0
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 504.2 | 722.6
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 117.5 | 61.0
Short | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 96.8 | 143.4
Short | Total return swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0.0 | 0.0
Short | Equity futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 0.0 | $ 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=121590274&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=121590274&loc=SL5579245-113959 + Details
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