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Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2020

Compensation Related Costs [Abstract]

Summarized RSU Activity Related to Stock Incentive Plan

The following table summarizes RSU activity related to the Stock Incentive Plan during the years ended December 31, 2020 and 2019:

		RSUs
		Number of Restricted Stock Units				Weighted Average Grant Date Fair Value Per Share
Non-vested as of January 1, 2019			3,338,184			$	24.05
Granted			1,607,204				21.83
Vested			(509,366	)			23.78
Forfeited			(641,491	)			24.07
Non-vested as of December 31, 2019			3,794,531				23.14
Granted			3,057,775				9.45
Vested			(921,060	)			21.07
Forfeited			(731,482	)			18.57
Non-vested as of December 31, 2020			5,199,764			$	16.10

Summary of Fair Value of Stock Options

The fair value of stock options was calculated using the following assumptions in the Black-Scholes model:

		December 31,
		2020		2019
Expected stock price volatility		31% - 37%		30% - 32%
Expected term of options		4.5 years		4.5 years
Expected dividend yield		—		—
Risk-free interest rate		0.25% - 1.41%		2.22% - 2.47%

Summary of Stock Option Activity

The following table summarizes stock option activity related to the Stock Incentive Plan during the year ended December 31, 2020:

		Stock Options
		Number of Stock Options				Weighted Average Exercise Price				Weighted Average Contractual Life (years)				Aggregate Intrinsic Value
Stock Options outstanding as of January 1, 2019			-			$	-				-			$	-
Granted			1,155,566				24.37
Forfeited			(165,312	)			24.39
Stock Options outstanding as of December 31, 2019			990,254				24.36				6.0				-
Granted			1,083,665				9.17
Forfeited			(348,696	)			18.39
Stock Options outstanding as of December 31, 2020			1,725,223				15.98				4.9				12
Vested and expected to vest at December 31, 2020			1,446,606				16.97				4.7				9
Exercisable at December 31, 2020			442,013			$	23.13				2.3			$	-

Summarized Stock-Based Compensation Expense and Related Tax Benefits

The following table summarizes stock-based compensation expense and the related tax benefits under the Company’s plans:

		Years Ended December 31,
		2020				2019				2018
Stock-based compensation expense before income taxes		$	29			$	25			$	20
Less: Income tax expense (benefit)			1				(1	)			(5	)
Stock-based compensation expense, net of income taxes		$	30			$	24			$	15

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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