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Investments - Offsetting of Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Asset derivatives |  |
Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheets | $ 6.8 | $ 10.7
Free-standing derivatives |  |
Asset derivatives |  |
Gross Amounts | 6.8 | 10.7
Gross Amounts Offset in the Consolidated Balance Sheets | 0.0 | 0.0
Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheets | 6.8 | 10.7
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments | 0.0 | 4.5
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received | 5.9 | 6.4
Net Amount | $ 0.9 |
Net Amount |  | $ (0.2)

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