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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 1,500,000,000 | $ 2,000,000,000.0
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 700,000,000 | 1,000,000,000.0
Interest rate swaps | US Dollars | Receiving a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 39,000,000.0 | 23,500,000
Foreign currency forward contracts, underwriting and non-investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 707,600,000 | 661,400,000
Foreign currency forward contracts, underwriting and non-investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 309,800,000 | 504,200,000
Foreign currency forward contracts, investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 273,000,000.0 | 269,500,000
Foreign currency forward contracts, investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 108,600,000 | 117,500,000
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 50,500,000 | 0
Credit default swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | 59,100,000 | 96,800,000
Total return swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 50,000,000.0 | 0
Equity futures |  |
Derivative [Line Items] |  |
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=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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