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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock, Restricted Stock Units, Performance Units, Cash Settled Restricted Stock Units and Cash Settled Performance Units
Shares
Non-vested awards at beginning of period (in shares)	2,446
Granted (in shares)	1,288
Vested (in shares)	(1,075)
Canceled (in shares)	(81)
Non-vested awards at end of period (in shares)	2,578	2,446
Weighted Average Grant Date Fair Value Per Share
Non-vested awards at beginning of period (in dollars per share)	$ 9.69
Granted (in dollars per share)	11.20	$ 9.37	$ 10.01
Vested (in dollars per share)	9.91
Canceled (in dollars per share)	9.85
Non-vested awards at end of period (in dollars per share)	$ 10.35	$ 9.69
Fair value of vested shares (in dollars)	$ 9.1	$ 7.1	$ 9.0
Cash-settled units
Shares
Non-vested awards at end of period (in shares)	523
Stock-settled awards and units
Shares
Non-vested awards at end of period (in shares)	2,055

X

- Definition

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

+ References

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- Definition

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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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