Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Equity Incentive Programs (Schedule of Restricted Stock and Restricted Stock Unit Award Activity) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at beginning of period (in shares)	2,961,750
Granted (in shares)	1,124,443
Vested (in shares)	(576,524)
Forfeited (in shares)	(59,672)
Nonvested at end of period (in shares)	3,449,997		2,961,750
Weighted- Average Grant Date Fair Value Per Share
Nonvested at beginning of period (in dollars per share)	$ 11.55
Granted (in dollars per share)	3.90
Vested (in dollars per share)	22.55
Forfeited (in dollars per share)	13.14
Nonvested at end of period (in dollars per share)	$ 7.19		$ 11.55
Weighted- Average Remaining Contractual Term (years)
Nonvested at beginning of period	1 year 10 months 24 days		1 year 3 months 18 days
Nonvested at end of period	1 year 10 months 24 days		1 year 3 months 18 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at beginning of period (in shares)	249,538
Granted (in shares)	41,553
Vested (in shares)	(18,586)
Forfeited (in shares)	0
Nonvested at end of period (in shares)	272,505		249,538
Weighted- Average Grant Date Fair Value Per Share
Nonvested at beginning of period (in dollars per share)	$ 11.70
Granted (in dollars per share)	3.82
Vested (in dollars per share)	22.60
Forfeited (in dollars per share)	0
Nonvested at end of period (in dollars per share)	$ 9.76		$ 11.70
Weighted- Average Remaining Contractual Term (years)
Nonvested at beginning of period	1 year 4 months 24 days		1 year 3 months 18 days
Nonvested at end of period	1 year 4 months 24 days		1 year 3 months 18 days
Deferred Stock Units (DSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)	221,616
Weighted- Average Grant Date Fair Value Per Share
Granted (in dollars per share)	$ 3.82
Weighted- Average Remaining Contractual Term (years)
Compensation expense	$ 0.8	$ 1.0