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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 2,200,000,000 | $ 2,500,000,000
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 935,700,000 | 1,000,000,000.0
Interest rate swaps | US Dollars | Paying a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 2,000,000.0 | 27,900,000
Interest rate swaps | US Dollars | Receiving a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 25,500,000 | 25,500,000
Foreign currency forward contracts, underwriting and non-investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 502,400,000 | 722,600,000
Foreign currency forward contracts, underwriting and non-investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 651,500,000 | 1,200,000,000
Foreign currency forward contracts, investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 384,800,000 | 195,600,000
Foreign currency forward contracts, investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 255,500,000 | 61,000,000.0
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 500,000 | 500,000
Credit default swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | 117,100,000 | 143,400,000
Total return swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 173,500,000 | 173,500,000
Total return swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | 0 | 0
Equity futures | Long |  |
Derivative [Line Items] |  |
Notional amount | 50,400,000 | 122,000,000.0
Equity futures | Short |  |
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=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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