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Business Segment Information - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025 distributionChannel segment	Jun. 30, 2024
Segment Reporting [Abstract]
Number of operating segments \| segment			1
Number of distribution channels \| distributionChannel			3
Revenue Benchmark \| Product Concentration Risk \| Japan
Revenue, Major Customer [Line Items]
Concentration risk	12.00%	10.00%	12.00%	10.00%
Revenue Benchmark \| Product Concentration Risk \| Japan \| Investment advisory and services fees
Revenue, Major Customer [Line Items]
Concentration risk	8.00%	6.00%	8.00%	6.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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