| Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net Income | -6 | 5 | -28 | 43 | 64 | 212 | 190 | 165 | 146 | 238 |
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| Equity-Based Compensation Expense | 39 | 89 | 116 | 118 | 112 | 121 | 109 | 166 | 179 | 209 |
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| Depreciation and Amortization Expense | - | - | - | - | 14 | 15 | 16 | 15 | 14 | 13 |
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| Amortization of Operating Lease Right-of-Use Assets | - | - | - | - | - | - | 19 | 21 | 23 | 16 |
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| Deferred Taxes | - | 2 | 31 | -8 | 12 | 7 | 7 | 2 | -2 | -9 |
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| Provision for Credit Losses | - | - | - | - | - | 1 | 3 | 3 | 5 | 4 |
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| Other | -1 | - | -0 | 1 | -4 | 4 | 5 | -3 | 1 | 2 |
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| Accounts Receivable | 5 | 65 | -41 | 37 | 11 | 5 | 61 | 32 | -52 | 56 |
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| Other Assets | 12 | 0 | 9 | 1 | 18 | 6 | 3 | 43 | 34 | -11 |
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| Accrued Compensation and Benefits | 53 | 63 | -46 | -5 | 30 | 130 | -131 | -35 | 88 | 118 |
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| Accounts Payable, Accrued Expenses and Other Liabilities | 21 | -1 | -0 | -2 | 1 | 1 | -2 | 2 | -28 | -12 |
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| Operating Lease Liabilities | - | - | - | - | -19 | -17 | -21 | -22 | - | - |
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| Taxes Payable | 1 | -0 | 1 | 5 | -2 | -2 | 1 | 0 | 3 | 1 |
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| Deferred Revenue | - | - | - | -0 | 6 | -4 | 3 | 0 | -3 | -1 |
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| Net Cash Provided by Operating Activities | - | - | - | 123 | 211 | 470 | 124 | 243 | 442 | 531 |
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| Purchases of Investments | - | - | 57 | 22 | 11 | 278 | 98 | 144 | 329 | 370 |
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| Proceeds from Sales and Maturities of Investments | - | - | 20 | 59 | 11 | 141 | 235 | 94 | 298 | 392 |
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| Purchases of Furniture, Equipment and Leasehold Improvements | 35 | 13 | 1 | 7 | 9 | 9 | 6 | 3 | 4 | 3 |
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| Cash Paid for Acquisition, Net of Cash Received | - | - | - | 61 | - | - | - | - | - | 11 |
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| Net Cash Provided by (Used in) Investing Activities | - | - | - | -31 | -2 | -146 | 131 | -53 | -34 | 8 |
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| Dividends | - | 4 | 4 | 4 | 5 | 5 | 78 | 25 | 24 | 24 |
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| Proceeds from Lines of Credit | - | - | - | - | 15 | 16 | 15 | 42 | 15 | - |
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| Payments on Revolving Credit Facility | - | - | - | - | 15 | 16 | 15 | 42 | 15 | - |
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| Principal Payments on Term Loan | - | - | - | - | 9 | 22 | - | - | - | - |
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| Tax Distributions | 5 | 12 | 24 | 0 | 11 | 55 | 38 | 38 | 43 | 48 |
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| Employee Taxes Paid for Shares Withheld | - | 0 | 4 | 22 | 10 | 13 | 23 | 18 | 19 | 37 |
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| Cash-Settled Exchanges of Partnership Units | - | 16 | 46 | 69 | 19 | 102 | 110 | 15 | 22 | 61 |
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| Treasury Stock Purchases | - | - | 2 | 65 | 48 | 49 | 103 | 109 | 117 | 235 |
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| Payments Pursuant to Tax Receivable Agreement | - | - | - | 0 | 0 | - | 2 | 5 | 2 | 3 |
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| Net Cash Used in Financing Activities | - | - | - | -131 | -101 | -244 | -353 | -210 | -228 | -409 |
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| Effect of Exchange Rate Changes on Cash and Cash Equivalents | - | - | - | -0 | 1 | 4 | -1 | -7 | 3 | -2 |
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| Net Increase (Decrease) in Cash and Cash Equivalents | - | - | - | -40 | 110 | 84 | -99 | -27 | 182 | 128 |
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| Income Taxes Paid, Net | - | 7 | 15 | 1 | 4 | 36 | 31 | 29 | 23 | 36 |
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| Payments for Interest | - | - | - | 0 | 1 | 0 | 0 | 0 | 0 | - |
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| Non-Cash Receipt of Shares | - | - | - | 2 | - | 1 | 1 | - | - | - |
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