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Investments - Offsetting of Assets and Liabilities (Details) - Free-standing derivatives - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Asset derivatives:    
Gross Amounts $ 9.3 $ 6.8
Gross Amounts Offset in the Consolidated Balance Sheets 0.0 0.0
Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheets 9.3 6.8
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 9.2 5.9
Net Amount $ 0.1  
Net Amount   $ 0.9