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Investments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Financial Asset Offsetting |  |
Gross amount of recognized assets subject to netting agreements | $ 352.3 | $ 527.2
Amount of liabilities that offset the gross amount of assets subject to netting agreements not offset in statement of financial position | (112.1) | (132.5)
Collateral received, financial assets | (232.3) | (357.2)
Net amount of assets subject to netting agreements | 7.9 | 37.5
Derivative assets |  |
Financial Asset Offsetting |  |
Gross amount of recognized assets subject to netting agreements | 328.1 | 463.5
Amount of liabilities that offset the gross amount of assets subject to netting agreements not offset in statement of financial position | (112.1) | (132.5)
Collateral received, financial assets | (208.1) | (293.5)
Net amount of assets subject to netting agreements | 7.9 | 37.5
Reverse repurchase agreements |  |
Financial Asset Offsetting |  |
Gross amount of recognized assets subject to netting agreements | 24.2 | 63.7
Collateral received, financial assets | $ (24.2) | $ (63.7)

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