Stock-Based Compensation Plans - Stock Option Awards (Details) - Stock Options shares in Thousands	6 Months Ended
Jun. 30, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance at beginning of period (in shares) \| shares	7,742
Granted (in shares) \| shares	758
Exercised or settled (in shares) \| shares	(800)
Forfeited (in shares) \| shares	(209)
Expired (in shares) \| shares	(5)
Balance at end of period (in shares) \| shares	7,486
Vested (in shares) \| shares	5,041
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Balance at beginning of period (in usd per share) \| $ / shares	$ 18.47
Granted (in usd per share) \| $ / shares	45.58
Exercised or settled (in usd per share) \| $ / shares	16.83
Forfeited (in usd per share) \| $ / shares	30.57
Expired (in usd per share) \| $ / shares	9.07
Balance at end of period (in usd per share) \| $ / shares	21.06
Vested (in usd per share) \| $ / shares	$ 15.69

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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