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Employee Compensation and Benefit Plans - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) trading_day shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Provident fund contribution percentage on portion of employees salary	12.00%
Contributions to 401(k)	$ 5,900,000	$ 4,800,000	$ 5,300,000
Future expected benefit payments, year three	2,800,000
Future expected benefit payments, year four	2,800,000
Unfunded status recognized in Other liabilities	(5,331,000)	(4,904,000)
Compensation expense recognized	$ 16,600,000	20,500,000	24,500,000
Common stock remaining available for future issuance (in shares) \| shares	6,841,386
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)	$ 8,400
Stock Options
Defined Benefit Plan Disclosure [Line Items]
Unrecognized compensation costs related to non-vested stock options	$ 600,000
Weighted average remaining requisite service period	1 year 9 months 18 days
Restricted Stock Units
Defined Benefit Plan Disclosure [Line Items]
Weighted average remaining requisite service period	1 year 10 months 18 days
Unvested awards, cost not yet recognized	$ 5,500,000
Liability Awards
Defined Benefit Plan Disclosure [Line Items]
Weighted average remaining requisite service period	2 years 4 months 1 day
Unvested awards, cost not yet recognized	$ 3,100,000
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	(2,000,000)	400,000
Future expected benefit payments, next twelve months	2,900,000
Future expected benefit payments, year two	2,800,000
Future expected benefit payments, year five	3,100,000
Future expected benefit payments, five subsequent years	15,700,000
Contributions to defined benefit pension plans	800,000	200,000	$ 100,000
Fair value of plan assets	41,220,000	36,439,000
Benefit obligation	54,603,000	49,122,000
Unfunded status recognized in Other liabilities	(13,383,000)	(12,683,000)
Gratuity Plan
Defined Benefit Plan Disclosure [Line Items]
Future expected benefit payments, next twelve months	1,000,000
Future expected benefit payments, year two	900,000
Future expected benefit payments, year three	800,000
Future expected benefit payments, year four	700,000
Future expected benefit payments, year five	600,000
Future expected benefit payments, five subsequent years	1,900,000
Plan assets, benefits paid	$ 900,000	$ 300,000
Long-Term Incentive (LTI) Program
Defined Benefit Plan Disclosure [Line Items]
Granted (in shares) \| shares	3,766,143
Grants in period, performance-based (percentage)	74.00%
Grants in period, time-based (percentage)	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 \| Long-Term Incentive (LTI) Program
Defined Benefit Plan Disclosure [Line Items]
Granted (in shares) \| shares	4,896,796
Chief Executive Officer \| Long-Term Incentive (LTI) Program \| Cash-Settled Awards
Defined Benefit Plan Disclosure [Line Items]
Granted (in shares) \| shares	3,766,143
Chief Executive Officer \| Long-Term Incentive (LTI) Program \| Equity-Settled Awards
Defined Benefit Plan Disclosure [Line Items]
Granted (in shares) \| shares	1,130,653
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)	33.33333%
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)	33.33333%
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)	33.33333%
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)	33.33333%
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)	33.33333%
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)	33.33333%