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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%