Commitments and Contingencies - Additional Information (Detail) - DST Systems Inc [Member] - USD ($) $ in Millions	Jul. 10, 2020	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Accrued liability and expense		$ 51.5
Other (expense) income [Member]
Loss Contingencies [Line Items]
Accrued liability and expense		$ 8.1	$ 43.4
Settled Litigation [Member] | Putative Claims [Member]
Loss Contingencies [Line Items]
Litigation settlement, expense	$ 27.0