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Deferred Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in deferred acquisition costs      
Balance at beginning of year, deferred acquisition costs $ 3,409.7 $ 3,521.3 $ 3,693.5
Costs deferred during the year 461.4 457.0 473.5
Amortization of deferred acquisition costs (285.4) (388.1) (347.0)
Adjustment related to unrealized (gains) losses on available-for-sale securities and derivative instruments 171.8 (180.5) (298.7)
Balance at end of year, deferred acquisition costs $ 3,757.5 $ 3,409.7 $ 3,521.3