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Investments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financial Asset Offsetting
Gross amount of recognized assets subject to netting agreements	$ 445.4	$ 353.5
Amount of liabilities that offset the gross amount of assets subject to netting agreements not offset in statement of financial position	(135.7)	(100.1)
Collateral received, financial assets	(276.3)	(246.1)
Net amount of assets subject to netting agreements	33.4	7.3
Derivative assets
Financial Asset Offsetting
Gross amount of recognized assets subject to netting agreements	321.0	337.1
Amount of liabilities that offset the gross amount of assets subject to netting agreements not offset in statement of financial position	(135.7)	(100.1)
Collateral received, financial assets	(151.9)	(229.7)
Net amount of assets subject to netting agreements	33.4	7.3
Reverse repurchase agreements
Financial Asset Offsetting
Gross amount of recognized assets subject to netting agreements	124.4	16.4
Collateral received, financial assets	$ (124.4)	$ (16.4)

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