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Investments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Financial Asset Offsetting |  |
Gross amount of recognized assets subject to netting agreements | $ 449.1 | $ 445.4
Amount of liabilities that offset the gross amount of assets subject to netting agreements not offset in statement of financial position | (178.5) | (135.7)
Collateral received, financial assets | (261.8) | (276.3)
Net amount of assets subject to netting agreements | 8.8 | 33.4
Derivative assets |  |
Financial Asset Offsetting |  |
Gross amount of recognized assets subject to netting agreements | 304.0 | 321.0
Amount of liabilities that offset the gross amount of assets subject to netting agreements not offset in statement of financial position | (178.5) | (135.7)
Collateral received, financial assets | (116.7) | (151.9)
Net amount of assets subject to netting agreements | 8.8 | 33.4
Reverse repurchase agreements |  |
Financial Asset Offsetting |  |
Gross amount of recognized assets subject to netting agreements | 145.1 | 124.4
Collateral received, financial assets | $ (145.1) | $ (124.4)

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