Business Segment Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2025 segment distributionChannel	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting [Abstract]
Number of operating segments | segment	1
Number of reportable segments not disclosed	one
Number of distribution channels | distributionChannel	3
Revenue Benchmark | Product Concentration Risk | Japan
Revenue, Major Customer [Line Items]
Concentration risk	12.00%	10.00%	8.00%
Revenue Benchmark | Product Concentration Risk | Japan | Investment Advice [Member]
Revenue, Major Customer [Line Items]
Concentration risk	15.00%	13.00%	11.00%