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Common Stock (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Summary of Stock Options

The following summarizes options activity:

		Year Ended December 31,
		2023								2022								2021
		Number				Average				Number				Average				Number				Average
		of				Exercise				of				Exercise				of				Exercise
		Shares				Price				Shares				Price				Shares				Price
Shares under option at beginning    of year			21,080,388			$	38.68				21,276,961			$	42.09				21,005,502			$	45.70
Granted			1,014,002				21.76				1,492,020				16.73				1,669,511				15.00
Forfeited			(1,908,768	)			57.61				(1,574,642	)			65.44				(1,398,052	)			63.65
Exercised			(210,519	)			16.68				(113,951	)			17.77				—				—
Shares under option at end of year			19,975,103			$	36.25				21,080,388			$	38.68				21,276,961			$	42.09
Exercisable at end of year			17,437,459			$	38.85				17,988,842			$	42.46				18,039,330			$	46.27

Summary of Stock Option Outstanding Information

The following summarizes information about stock options outstanding at December 31, 2023:

		Weighted-Avg				Options Outstanding								Options Exercisable
		Remaining								Weighted-Avg								Weighted-Avg
Range of Exercise Price		Contractual Life				Shares				Exercise Price				Shares				Exercise Price
$15.00 - $30.00			5.83				8,405,053			$	21.82				5,867,409			$	23.32
$30.01 - $50.00			2.82				6,307,350				36.25				6,307,350				36.25
$50.01 - $69.00			0.81				5,262,700				59.29				5,262,700				59.29
Total			3.56				19,975,103			$	36.25				17,437,459			$	38.85

Assumption Used in Determination of Fair Value of Share Based Payment Awards

The use of the Black Scholes model requires the use of actual employee exercise activity data and the use of a number of complex assumptions including expected volatility, risk-free interest rate, expected dividends and expected term.

		Year Ended December 31,
Valuation Assumptions:		2023				2022				2021
Expected volatility			45.7	%			43.6	%			43.4	%
Risk-free interest rate			4.1	%			1.9	%			0.6	%
Expected dividend yield			0.9	%			1.2	%			0.0	%
Expected term (in years)			5.8				5.4				5.1

Summary of Information and Changes in Stock Options with Regard to Stock Option Plans

The following summary presents information regarding outstanding options at December 31, 2023 and changes during 2023 with regard to options under all stock option plans:

						Weighted- Average				Weighted Average Remaining Contractual				Aggregate
		Shares				Exercise Price				Term (years)				Intrinsic Value
Outstanding at December 31, 2022			21,080,388			$	38.68				4.01			$	—
Granted			1,014,002			$	21.76
Forfeited			(1,908,768	)		$	57.61
Exercised			(210,519	)		$	16.68
Outstanding at December 31, 2023			19,975,103			$	36.25				3.56			$	—
Exercisable at December 31, 2023			17,437,459			$	38.85				2.90			$	—

Summary of Information Regarding Outstanding SARs

The following summary presents information regarding outstanding SARs:

		Year Ended December 31,
		2023								2022
		Number				Average				Number				Average
		of				Exercise				of				Exercise
		Shares				Price				Shares				Price
Shares under SARs at beginning of year			1,105,106			$	28.39				1,193,934			$	28.40
Granted			—				—				—				—
Forfeited			(48,301	)			28.83				(88,828	)			28.61
Exercised			—				—				—				—
Shares under SARs at end of year			1,056,805			$	28.37				1,105,106			$	28.39
Exercisable at end of year			1,056,805			$	28.37				1,105,106			$	28.39

Summary of Information Regarding Outstanding Restricted Shares

The following summary presents information regarding outstanding restricted shares:

	Year Ended December 31,
	2023								2022								2021
					Weighted-								Weighted-								Weighted-
	Number				Average				Number				Average				Number				Average
	of				Grant Date				of				Grant Date				of				Grant Date
	Units				Fair Value				Units				Fair Value				Units				Fair Value
Nonvested at beginning of year		7,188,183			$	18.30				6,936,574			$	21.32				6,073,963			$	31.85
Granted		2,792,465			$	22.70				3,509,425			$	17.67				3,772,842			$	15.03
Vested		(3,045,126	)		$	21.77				(2,863,385	)		$	17.11				(2,672,507	)		$	15.38
Forfeited		(320,044	)		$	23.89				(394,431	)		$	26.00				(237,724	)		$	63.65
Nonvested at end of year		6,615,478			$	19.86				7,188,183			$	18.30				6,936,574			$	21.32

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

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year.

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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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