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Employee Compensation and Benefit Plans - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Sep. 10, 2020 shares | Dec. 31, 2020 USD ($) trading_day shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Provident fund contribution percentage on portion of employees salary |  | 12.00% |  |
Contributions to 401(k) |  | $ 5,200,000 | $ 5,900,000 | $ 4,800,000
Benefit obligation discount rate |  | 2.25% | 3.25% |
Benefit obligation, period increase (decrease) |  | $ 6,800,000 |  |
Future expected benefit payments, year two |  | 2,800,000 |  |
Future expected benefit payments, year three |  | 2,900,000 |  |
Future expected benefit payments, year four |  | 2,800,000 |  |
Compensation expense recognized |  | $ 25,700,000 | $ 16,600,000 | 20,500,000
Common stock remaining available for future issuance (in shares) | shares |  | 249,746 |  |
Contractual term of all options granted (years) |  | 10 years |  |
Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of employee contributions |  | 50.00% |  |
Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer match limit, percent of employee compensation |  | 6.00% |  |
Matching compensation per pay period (usd per pay period) |  | $ 8,550 |  |
Stock Options |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unrecognized compensation costs related to non-vested stock options |  | $ 300,000 |  |
Weighted average remaining requisite service period |  | 9 months 21 days |  |
Restricted Stock Units |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Weighted average remaining requisite service period |  | 1 year 4 months 24 days |  |
Unvested awards, cost not yet recognized |  | $ 3,300,000 |  |
Liability Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Weighted average remaining requisite service period |  | 1 year 6 months 14 days |  |
Unvested awards, cost not yet recognized |  | $ 15,700,000 |  |
Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost |  | (200,000) | (2,000,000.0) | 400,000
Future expected benefit payments, next twelve months |  | 2,900,000 |  |
Future expected benefit payments, year five |  | 3,000,000.0 |  |
Future expected benefit payments, five subsequent years |  | 15,700,000 |  |
Contributions to defined benefit pension plans |  | 2,100,000 | 800,000 | 200,000
Fair value of plan assets |  | 46,303,000 | 41,220,000 |
Benefit obligation |  | 58,965,000 | 54,603,000 |
Unfunded status recognized in Other liabilities |  | (12,662,000) | (13,383,000) |
Gratuity Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Future expected benefit payments, next twelve months |  | 1,100,000 |  |
Future expected benefit payments, year two |  | 1,000,000.0 |  |
Future expected benefit payments, year three |  | 800,000 |  |
Future expected benefit payments, year four |  | 800,000 |  |
Future expected benefit payments, year five |  | 600,000 |  |
Future expected benefit payments, five subsequent years |  | 2,100,000 |  |
Fair value of plan assets |  | 40,000 | 39,000 |
Benefit obligation |  | 6,091,000 | 5,370,000 |
Unfunded status recognized in Other liabilities |  | (6,051,000) | (5,331,000) |
Plan assets, benefits paid |  | $ 800,000 | $ 900,000 | $ 300,000
Long-Term Incentive (LTI) Program |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Granted (in shares) | shares |  | 601,787 | 251,076 |
Grants in period, performance-based (percentage) |  | 50.00% | 74.00% |
Grants in period, time-based (percentage) |  | 50.00% | 26.00% |
Long-Term Incentive (LTI) Program | Performance-Based Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting percentage of awards (percentage) |  | 100.00% |  |
Number of trading days used in total shareholder return calculation | trading_day |  | 30 |  |
Chief Executive Officer |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Granted (in shares) | shares |  | 150,000 | 75,377 | 65,534
Chief Executive Officer | Long-Term Incentive (LTI) Program | Cash-Settled Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Granted (in shares) | shares |  | 543,896 | 251,076 |
Chief Executive Officer | Long-Term Incentive (LTI) Program | Equity-Settled Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Granted (in shares) | shares | 57,891 | 150,000 | 75,377 |
Chief Executive Officer | Long-Term Incentive (LTI) Program | Liability Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Granted (in shares) | shares |  | 693,896 | 326,453 |
Share-based Payment Arrangement, Tranche One | Long-Term Incentive (LTI) Program | Time-Based Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting percentage of awards (percentage) |  | 33.33% |  |
Share-based Payment Arrangement, Tranche One | Long-Term Incentive (LTI) Program | Performance-Based Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Award vesting period (years) |  | 1 year |  |
Share-based Payment Arrangement, Tranche One | Long-Term Incentive (LTI) Program | One-Time Retention and Transitional Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting percentage of awards (percentage) |  | 33.33% |  |
Share-based Payment Arrangement, Tranche Two | Long-Term Incentive (LTI) Program | Time-Based Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting percentage of awards (percentage) |  | 33.33% |  |
Share-based Payment Arrangement, Tranche Two | Long-Term Incentive (LTI) Program | Performance-Based Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Award vesting period (years) |  | 2 years |  |
Share-based Payment Arrangement, Tranche Two | Long-Term Incentive (LTI) Program | One-Time Retention and Transitional Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting percentage of awards (percentage) |  | 33.33% |  |
Share-based Payment Arrangement, Tranche Three | Long-Term Incentive (LTI) Program | Time-Based Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting percentage of awards (percentage) |  | 33.33% |  |
Share-based Payment Arrangement, Tranche Three | Long-Term Incentive (LTI) Program | Performance-Based Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Award vesting period (years) |  | 3 years |  |
Share-based Payment Arrangement, Tranche Three | Long-Term Incentive (LTI) Program | One-Time Retention and Transitional Awards |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting percentage of awards (percentage) |  | 33.33% |  |

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