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Derivative Instruments - Narrative (Details) - Not Designated as Hedging Instrument - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 0 | $ 0
Total return swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0 | 0
Long | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 5,900,000,000 | 2,400,000,000
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 805,200,000 | 861,700,000
Long | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 420,700,000 | 225,600,000
Long | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 22,100,000 | 953,400,000
Long | Equity futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 0 | 116,000,000
Long | Commodity futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 255,200,000 | 0
Long | Commodity options |  |
Derivative [Line Items] |  |
Derivative, notional amount | 400,000 | 0
Short | Interest rate futures |  |
Derivative [Line Items] |  |
Derivative, notional amount | 2,700,000,000 | 500,000,000
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 496,400,000 | 172,400,000
Short | Foreign currency forward contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 130,000,000 | 86,300,000
Short | Credit default swaps |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,500,000,000 | 13,100,000
Short | Commodity options |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 0 | $ 0

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