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Investments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Financial Asset Offsetting
Gross amount of recognized assets subject to netting agreements	$ 768.6	$ 449.1
Amount of liabilities that offset the gross amount of assets subject to netting agreements not offset in statement of financial position	(254.8)	(178.5)
Collateral received, financial assets	(512.5)	(261.8)
Net amount of assets subject to netting agreements	1.3	8.8
Derivative assets
Financial Asset Offsetting
Gross amount of recognized assets subject to netting agreements	648.2	304.0
Amount of liabilities that offset the gross amount of assets subject to netting agreements not offset in statement of financial position	(254.8)	(178.5)
Collateral received, financial assets	(392.1)	(116.7)
Net amount of assets subject to netting agreements	1.3	8.8
Reverse repurchase agreements
Financial Asset Offsetting
Gross amount of recognized assets subject to netting agreements	120.4	145.1
Collateral received, financial assets	$ (120.4)	$ (145.1)

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Collateral received for derivative and other financial assets (reverse repurchase agreements and securities lending transactions) subject to master netting agreements or similar agreements.

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