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

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

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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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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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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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Employee Benefit Plans - Restricted Stock Awards (Details) - Restricted Stock - USD ($) $ / shares in Units, $ in Millions							12 Months Ended
	Dec. 08, 2021	Oct. 01, 2021	Jul. 23, 2021	Jul. 01, 2021	Apr. 01, 2021	Jan. 04, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares
Awards outstanding at beginning of year (in shares)							1,176,951	1,173,045	1,320,989
Stock awards granted (in shares)	273,558	12,685	14,664	8,403	9,282	14,249	332,841	667,752	846,835
Vested (in shares)							(656,066)	(631,498)	(993,361)
Forfeited (in shares)								(32,348)	(1,418)
Awards outstanding at end of year (in shares)							853,726	1,176,951	1,173,045
Grant Date Fair Value
Awards outstanding at beginning of year (in dollars per share)							$ 6.61	$ 6.81	$ 7.40
Granted (in dollars per share)	$ 3.29	$ 3.88	$ 4.54	$ 5.71	$ 5.05	$ 4.20	3.59	7.06	6.02
Vested (in dollars per share)							6.35	7.52	6.92
Forfeited (in dollars per share)								5.41	8.82
Awards outstanding at end of year (in dollars per share)							$ 5.62	$ 6.61	$ 6.81
Fair value of awards vested							$ 2.6	$ 5.4	$ 6.5
Compensation cost							3.3	$ 4.2	$ 6.2
Future share-based compensation							$ 2.2
Weighted average vesting period (in years)							8 months 12 days