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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 3,700,000,000 | $ 1,900,000,000
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 202,300,000 | 545,800,000
Interest rate swaps | US Dollars | Paying a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 32,200,000 | 78,400,000
Interest rate swaps | US Dollars | Receiving a Fixed Rate |  |
Derivative [Line Items] |  |
Notional amount | 23,500,000 | 32,100,000
Foreign currency forward contracts, underwriting and non-investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 786,000,000.0 | 354,100,000
Foreign currency forward contracts, underwriting and non-investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 820,400,000 | 601,200,000
Foreign currency forward contracts, investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 128,100,000 | 121,300,000
Foreign currency forward contracts, investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 40,700,000 | 42,900,000
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 0 | 1,000,000.0
Credit default swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | 88,500,000 | 126,200,000
Total return swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 225,000,000.0 |
Total return swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | 0 |
Equity futures | Long |  |
Derivative [Line Items] |  |
Notional amount | 0 | 44,700,000
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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