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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended			12 Months Ended
	Jun. 25, 2020	May 30, 2019	May 16, 2014	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 23, 2020	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award
Performance period							3 years
Stock based compensation costs							$ 64,466	$ 40,722	$ 35,051
Tax benefit from compensation expense							9,300	5,800	5,700
Tax benefits (loss) realized from option exercises							3,700	8,400	4,600
Award Incentive Bonus
Share-based Compensation Arrangement by Share-based Payment Award
Stock based compensation costs							$ 5,700	$ 6,700	$ 6,700
Vested shares issued (in shares)					44,788	58,783
Weighted-average grant date fair value (in dollars per share)					$ 150.03	$ 113.55
Award Incentive Bonus | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award
Vested shares issued (in shares)				58,058
Weighted-average grant date fair value (in dollars per share)				$ 108.03
WRL Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award
Term of plan			10 years
Shares authorized for issuance	5,909,390		4,409,390
Increase in shares authorized for issuance (in shares)	1,500,000
Aggregate amount of common stock available for grant							3,495,890
Stock options granted (in shares)							0	0	0
Unvested awards compensation not yet recognized							$ 63,400
Unvested awards compensation costs period of recognition							1 year 7 months 28 days
Vested shares issued (in shares)							841,226
Weighted-average grant date fair value (in dollars per share)							$ 99.21	$ 119.61	$ 170.13
WML Share Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Term of plan		10 years
Shares authorized for issuance		519,695,860
Aggregate amount of common stock available for grant							510,800,860
WML Share Award Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized for issuance											75,000,000
Aggregate amount of common stock available for grant							50,290,387
Unvested awards compensation not yet recognized							$ 14,100
Unvested awards compensation costs period of recognition							1 year 4 months 6 days
Vested shares issued (in shares)							6,747,501
Weighted-average grant date fair value (in dollars per share)							$ 1.86	$ 2.43	$ 3.07
WIL Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized for issuance										101,419
Aggregate amount of common stock available for grant							20,573

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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