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Investments - Offsetting of Assets and Liabilities (Details) - Free-standing derivatives - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Asset derivatives: |  |
Gross Amounts | $ 23.1 | $ 19.0
Gross Amounts Offset in the Consolidated Balance Sheets | 0.0 | 0.0
Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheets | 23.1 | 19.0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments | 0.0 | 0.0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received | 23.6 | 18.5
Net Amount | $ (0.5) |
Net Amount |  | $ 0.5

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