Deferred Acquisition Costs and Other Actuarial Balances - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Long-duration and short-duration insurance
Deferred Acquisition Costs
Amortization of deferred acquisition costs	$ 97.5	$ 97.1	$ 292.8	$ 289.5