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Share-Based Payment Awards (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock Option Activity

The following table summarizes the Company's stock option activity for the year ended December 31, 2020 (in thousands, except weighted-average exercise price and weighted-average contractual life):

						2012 Plan Stock Options						Weighted- Average Exercise Price						Weighted- Average Contractual Life						Aggregate Intrinsic Value
Outstanding, January 1, 2020						352.2						$	13.95
Exercised						(254.3)						$	13.62
Canceled						—						$	—
Outstanding, December 31, 2020						97.9						$	14.80					1.0 year						$	221.7
Vested or expected to vest						97.9						$	14.80					1.0 year						$	221.7
Exercisable, December 31, 2020						97.9						$	14.80					1.0 year						$	221.7

Summary of Non-vested Restricted Stock Unit Activity

The following table summarizes non-vested restricted stock unit activity for the year ended December 31, 2020 (in thousands, except weighted-average grant-date fair value amounts):

						2012 Plan Restricted Stock Units						Weighted- Average Grant-date Fair Value
Outstanding, January 1, 2020						454.7						$	27.33
Granted						286.2						$	22.01
Vested						(135.3)						$	25.14
Canceled						(55.1)						$	23.93
Outstanding, December 31, 2020						550.5						$	25.44

Schedule of Fair Value Assumptions of Market-based Awards

The fair value of the Company's market-based awards is estimated using the Company's stock price on the date of grant and the probability of vesting using a Monte Carlo simulation with the following weighted-average assumptions:

						2020 Grants						2019 Grants						2018 Grants
Volatility of A&B common stock						22.6		%				23.6		%				22.7		%
Average volatility of peer companies						22.5		%				24.2		%				21.6		%
Risk-free interest rate						1.3		%				2.5		%				2.3		%

Summary of Compensation Cost related to Share-based Payments

A summary of compensation cost related to share-based payments is as follows for the years ended December 31, 2020, 2019 and 2018 (in millions):

						2020						2019						2018
Share-based expense:
Time-based and market-based restricted stock units						$	5.8					$	5.4					$	4.7
Total share-based expense						5.8						5.4						4.7
Total recognized tax benefit						—						—						—
Share-based expense (net of tax)						$	5.8					$	5.4					$	4.7
Cash received upon option exercise						$	3.5					$	2.6					$	0.4
Intrinsic value of options exercised						$	0.5					$	2.6					$	0.4
Tax benefit realized upon option exercise						$	—					$	—					$	—
Fair value of stock vested						$	3.0					$	4.5					$	4.0

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Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block]

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. Also includes disclosures of other measures related to share-based payments, including, but not limited to, cash proceeds received from the exercise of stock options and similar instruments granted under share-based payment arrangements and the intrinsic value of stock options exercised during the period.

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

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-Name Accounting Standards Codification
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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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