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Deferred Acquisition Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Change in deferred acquisition costs        
Balance at beginning of year, deferred acquisition costs $ 4,102.7 $ 3,613.5 $ 3,757.5 $ 3,409.7
Costs deferred during the year 89.4 114.4 198.0 237.1
Amortization of deferred acquisition costs (218.4) (85.2) (330.5) (158.5)
Adjustment related to unrealized (gains) losses on available-for-sale securities and derivative instruments 366.6 (61.5) 715.3 92.9
Balance at end of year, deferred acquisition costs $ 4,340.3 $ 3,581.2 $ 4,340.3 $ 3,581.2