Employee Service Share-based Compensation, Nonvested Awards, Modifications to Awards

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Number of directors elected.

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The 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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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Performance Objective Measurement Period

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

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

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Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Price of a single share of a number of saleable stocks of a company.

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Percentage of vesting of award under share-based payment arrangement.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accounting for Stock-Based Compensation - Additional Information (Details)			3 Months Ended			6 Months Ended
	Mar. 01, 2021 USD ($) Director shares	Mar. 01, 2020 USD ($) Director shares	Jun. 30, 2021 USD ($) $ / shares shares	Mar. 31, 2021 shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2021 USD ($) Item $ / shares shares	Jun. 30, 2020 USD ($) Item $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, unrecognized compensation costs on nonvested awards			$ 34,000,000			$ 34,000,000
Employee service share-based compensation total compensation cost not yet recognized, period for recognition						27 months
Employee service share-based compensation, nonvested awards, modifications to awards \| Item						0	0
Aggregate intrinsic value of options exercised			0		$ 0		$ 0
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised						$ 1,000,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation total compensation cost not yet recognized, period for recognition						27 months
Employee service share-based compensation, unrecognized compensation costs on nonvested stock options			$ 6,000,000			$ 6,000,000
Share-based compensation arrangement by share-based payment award, options, grants in period \| shares			0	749,250	0
Weighted-average grant date fair value of stock options \| $ / shares						$ 6.22	$ 3.17
Share Price \| $ / shares			$ 15.44			$ 15.44
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation total compensation cost not yet recognized, period for recognition						27 months
Employee service share-based compensation, unrecognized compensation costs on nonvested awards other than options			$ 28,000,000			$ 28,000,000
Restricted Stock, Performance-Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by payment award, performance objective measurement period						3 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, number of grants \| shares				173,664
Number of directors elected to defer the receipt of RSUs granted \| Director	4	5
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement award vesting rights						one-third increments on each of the first three anniversaries of the award date
Share-based compensation, number of grants \| shares			30,000	2,829,250
Plan 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement award vesting rights						one-third increments on each of the first three anniversaries of the award date
Contractual term of option granted						10 years
Unissued common stock reserved for grants \| shares			12,484,327			12,484,327
Plan 2009 \| Restricted Stock Units (RSUs) \| Non-management Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, number of grants \| shares	19,296	34,483
Fair value of units granted	$ 170,000	$ 170,000
Performance-Based Awards Granted On March 1, 2018 \| Restricted Stock, Performance-Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement award vesting rights, percentage	200.00%