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Stock-Based Compensation - Schedule of Nonvested Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
WRL Omnibus Plan
Shares:
Nonvested, beginning of period	744,451
Granted	841,226
Vested	(414,934)
Forfeited	(241,108)
Nonvested, end of period	929,635	744,451
Weighted Average Grant Date Fair Value:
Nonvested, beginning of period	$ 123.62
Granted	99.21	$ 119.61	$ 170.13
Vested	97.84
Forfeited	127.04
Nonvested, end of period	112.11	123.62
Weighted average grant date fair value	$ 99.21	$ 119.61	$ 170.13
Fair value of shares vested	$ 34,068	$ 19,428	$ 13,024
WML Share Award Plan
Shares:
Nonvested, beginning of period	9,666,163
Granted	6,747,501
Vested	(4,526,175)
Forfeited	(1,008,711)
Nonvested, end of period	10,878,778	9,666,163
Weighted Average Grant Date Fair Value:
Nonvested, beginning of period	$ 2.36
Granted	1.86	$ 2.43	$ 3.07
Vested	1.67
Forfeited	2.47
Nonvested, end of period	2.33	2.36
Weighted average grant date fair value	$ 1.86	$ 2.43	$ 3.07
Fair value of shares vested	$ 8,371	$ 5,139	$ 12,442

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Topic 718
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-Section 50
-Paragraph 2
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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