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Investments - Balance Sheet Offsetting, Liabilities (Details) - Derivative liabilities - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Financial Liability Offsetting |  |
Gross amount of recognized liabilities subject to netting agreements | $ 576.8 | $ 506.0
Amount of assets that offset the gross amount of liabilities subject to netting agreements not offset in statement of financial position | (261.8) | (254.8)
Collateral pledged, financial liabilities | (310.0) | (239.4)
Net amount of liabilities subject to netting agreements | $ 5.0 | $ 11.8

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