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Investments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Financial Asset Offsetting
Gross amount of recognized assets subject to netting agreements	$ 725.3	$ 768.6
Amount of liabilities that offset the gross amount of assets subject to netting agreements not offset in statement of financial position	(239.5)	(254.8)
Collateral received, financial assets	(475.7)	(512.5)
Net amount of assets subject to netting agreements	10.1	1.3
Derivative assets
Financial Asset Offsetting
Gross amount of recognized assets subject to netting agreements	610.8	648.2
Amount of liabilities that offset the gross amount of assets subject to netting agreements not offset in statement of financial position	(239.5)	(254.8)
Collateral received, financial assets	(361.2)	(392.1)
Net amount of assets subject to netting agreements	10.1	1.3
Reverse repurchase agreements
Financial Asset Offsetting
Gross amount of recognized assets subject to netting agreements	114.5	120.4
Collateral received, financial assets	$ (114.5)	$ (120.4)

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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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