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Note 15 - Segment Information | 9 Months Ended
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Sep. 30, 2025
Notes to Financial Statements |
Segment Reporting Disclosure [Text Block] | Note 15 — Segment Information We are a global asset manager and manage a range of investment products, operating across various product lines, distribution channels and geographic regions. However, information is reported to the chief operating decision-maker (“CODM”), our Chief Executive Officer (“CEO”), on an aggregated basis. Strategic and financial management decisions are determined centrally by our CEO and, on this basis, we operate as a single-segment investment management business. Our investment management segment primarily derives revenues from management fees. Clients pay a management fee, which is usually calculated as a percentage of AUM. Certain investment products are also subject to performance fees, which vary based on when performance hurdles or other specified criteria are achieved. The level of assets subject to such fees can positively or negatively affect our revenue. Management and performance fees are generated from a diverse group of funds and other investment products and are the primary drivers of our revenue. The accounting policies of the investment management segment are the same as those described in Note 2 — Summary of Significant Accounting Policies, in Part II, Item 8, Financial Statements and Supplementary Data, in our Annual Report on Form 10-K for the year ended December 31, 2024. The CODM assesses performance for the investment management segment and decides how to allocate resources based on net income attributable to JHG on the Condensed Consolidated Statements of Comprehensive Income. Refer to the Condensed Consolidated Statements of Comprehensive Income for information on our significant segment expenses. All of our revenue is earned from external customers. The measure of segment assets is reported on the Condensed Consolidated Balance Sheets as total assets. Segment assets are identical to the total assets on our Condensed Consolidated Balance Sheets. Significant noncash items include depreciation and amortization, stock-based compensation plan expense and investment gains and losses. Refer to our Condensed Consolidated Statements of Cash Flows for a comprehensive listing of our noncash adjustments.

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- Definition The entire disclosure for reporting segments including data and tables. 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