Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Total revenue	$ 2,125,151	$ 1,919,793	$ 1,991,037
Expenses:
Subadvisory, distribution and other asset management costs	191,706	189,263	196,732
Software royalties and other information processing costs	34,229	32,289	29,006
Compensation, benefits and other personnel	770,881	714,099	720,029
Stock-based compensation	58,626	31,308	39,403
Consulting, outsourcing and professional fees	211,806	231,469	242,013
Data processing and computer related	151,653	137,036	125,171
Facilities, supplies and other costs	79,282	85,836	74,993
Amortization	41,869	38,669	54,280
Depreciation	33,358	35,300	33,657
Total expenses	1,573,410	1,495,269	1,515,284
Income from operations	551,741	424,524	475,753
Net gain (loss) from investments	2,790	2,757	(3,078)
Interest and dividend income	48,897	41,027	13,308
Interest expense	(563)	(583)	(749)
Other income	8,151	0	3,379
Equity in earnings of unconsolidated affiliates	135,741	126,930	120,667
Income before income taxes	746,757	594,655	609,280
Income taxes	165,566	132,397	133,813
Net income	$ 581,191	$ 462,258	$ 475,467
Basic earnings per common share (in USD per share)	$ 4.47	$ 3.49	$ 3.49
Shares used to compute basic earnings per share (in shares)	130,073	132,593	136,071
Diluted earnings per common share (in USD per share)	$ 4.41	$ 3.46	$ 3.46
Shares used to compute diluted earnings per share (in shares)	131,727	133,728	137,423
Dividends declared per common share (in USD per share)	$ 0.95	$ 0.89	$ 0.83
Asset management, administration and distribution fees
Revenues:
Total revenue	$ 1,677,143	$ 1,514,815	$ 1,514,063
Information processing and software servicing fees
Revenues:
Total revenue	$ 448,008	$ 404,978	$ 476,974