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Compensation and Benefits - Components of expense (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 35,800 | $ 21,000 | $ 15,900 |
Salaries, incentive compensation and benefits | 516,931 | 399,325 | 358,339 |
Restricted share-based award compensation expense | 39,236 | 36,493 | 42,117 |
Long-term incentive compensation expense | 46,123 | 36,493 | 42,117 |
Total compensation and benefits | $ 563,054 | $ 435,818 | 400,456 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 3,881,524 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 60,000 |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 0 | $ 0 | 0 |
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | 35,000 |  |  |
Deferred Bonus |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense | 6,887 | $ 0 | $ 0 |
2021 Grant |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | 44,100 |  |  |
Unvested restricted share-based awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 76,500 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 3 years 3 months 18 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period | 5 years |  |  |
Granted in Period, Number of Shares | 741,555 | 919,455 | 963,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 5,245,394 | 5,293,642 | 5,005,422 | 4,678,457
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 5,200 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 2 years 9 months 18 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period | 3 years |  |  |
Granted in Period, Number of Shares | 75,230 | 60,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 135,230 | 60,000 | 0 |
Performance Shares | Pro Forma |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 135,233 |  |  |
Share-based Payment Arrangement |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted in Period, Number of Shares | 740,249 |  |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted in Period, Number of Shares | 1,306 |  |  |
Long-Term Cash Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Other Deferred Compensation Arrangements, Liability, Current and Noncurrent | $ 6,900 |  |  |
Long-Term Cash Awards | Operating Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long-Term Incentive Compensation Expense | 520 | $ 0 | $ 0 |
Long-Term Cash Awards | Nonoperating Income (Expense) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Net investment gain (loss) of consolidated investment products | $ 2,717 | $ 0 | $ 0 |

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