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Stock-Based Compensation - Summary of Restricted Stock Grants and PSUs (Details) shares in Millions	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Restricted Stock
Number of Restricted Shares
Outstanding and non-vested, at December 31, 2020 | shares	0.2
Granted | shares	0.1
Vested | shares	(0.1)
Forfeited | shares	0.0
Outstanding and non-vested, at December 31, 2021 | shares	0.2
Weighted Average Price per Share
Outstanding and non-vested, at December 31, 2020 | $ / shares	$ 26.18
Granted | $ / shares	42.59
Vested | $ / shares	23.95
Forfeited | $ / shares	30.06
Outstanding and non-vested, at December 31, 2021 | $ / shares	$ 32.15
PSUs
Number of Restricted Shares
Outstanding and non-vested, at December 31, 2020 | shares	0.2
Granted | shares	0.1
Vested | shares	(0.1)
Forfeited | shares	0.0
Outstanding and non-vested, at December 31, 2021 | shares	0.2
Weighted Average Price per Share
Outstanding and non-vested, at December 31, 2020 | $ / shares	$ 27.60
Granted | $ / shares	42.86
Vested | $ / shares	27.29
Forfeited | $ / shares	29.34
Outstanding and non-vested, at December 31, 2021 | $ / shares	$ 34.87

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Paragraph 2
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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