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Deferred Acquisition Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Change in deferred acquisition costs |  |  |  |
Balance at beginning of year, deferred acquisition costs | $ 4,340.3 | $ 3,581.2 | $ 3,757.5 | $ 3,409.7
Costs deferred during the year | 87.5 | 118.0 | 285.5 | 355.1
Amortization of deferred acquisition costs | 4.0 | (34.3) | (326.5) | (192.8)
Adjustment related to unrealized (gains) losses on available-for-sale securities and derivative instruments | 402.2 | 32.0 | 1,117.5 | 124.9
Balance at end of year, deferred acquisition costs | $ 4,834.0 | $ 3,696.9 | $ 4,834.0 | $ 3,696.9

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