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Equity-Based Compensation and Cash Awards - PSU awards (Details) $ / shares in Units, $ in Millions		1 Months Ended			12 Months Ended
	Apr. 15, 2021	Apr. 30, 2021 item	Jul. 31, 2020 USD ($)	Jan. 31, 2020 USD ($) tranche	Dec. 31, 2021 USD ($) item $ / shares shares	Dec. 31, 2020 USD ($) item $ / shares shares	Dec. 31, 2019 $ / shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Awards
Unvested cash awards recorded in other liabilities \| $					$ 2.0	$ 3.0
2013 Plan
Additional disclosures
Number of tranches \| tranche				3
Cash Awards
Cash awards granted \| $				$ 3.0
2020 Plan
Stock-based compensation
Vesting period			4 years
Cash Awards
Cash awards granted \| $			$ 3.0
PSUs
Number of units
Total awarded and unvested at the beginning of the period (in shares) \| shares					2,547,798
Granted (in shares) \| shares					479,120
Forfeited (in shares) \| shares					(67,000)
Cancelled (unearned) \| shares					(1,112,639)
Total awarded and unvested at the end of the period (in shares) \| shares					1,847,279	2,547,798
Weighted average grant date fair value
Total awarded and unvested at the beginning of the period (in dollars per share)					$ 12.66
Granted (in dollars per share)					9.71
Forfeited (in dollars per share)					2.97
Cancelled (unearned) (in dollars per share)					19.19
Total awarded and unvested at the end of the period (in dollars per share)					$ 8.31	$ 12.66
Additional disclosures
Unamortized equity-based compensation expense \| $					$ 6.0
Weighted average period for recognizing unrecognized stock-based compensation expense					1 year 10 months 24 days
Weighted-average assumptions used to calculate fair value of performance share units granted
Volatility (as a percent)					85.00%	80.00%	36.00%
Risk-free interest rate (as a percent)					0.32%	0.17%	2.35%
Weighted average fair value of awards granted-Absolute TSR					$ 11.99	$ 2.63	$ 9.26
Weighted average fair value of awards granted-Absolute Relative TSR						$ 3.30
PSU Awards Based on Absolute TSR
Stock-based compensation
Price target as a percentage of beginning price							125.00%	125.00%
Number of performance periods \| item					3	3
Number of cumulative performance periods					1	1
Service period					3 years	3 years	3 years	3 years
Amortization period of PSU expense						3 years		3 years
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent	150.00%
PSU Awards Based on Absolute TSR \| Minimum
Stock-based compensation
Number of PSUs that may vest, as a percent					0.00%	0.00%
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent							0.00%	0.00%
PSU Awards Based on Absolute TSR \| Maximum
Stock-based compensation
Number of PSUs that may vest, as a percent					200.00%	150.00%
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent								200.00%
PSU Awards Based on Absolute TSR \| One Year Period
Stock-based compensation
Service period					1 year	1 year
PSU Awards Based on Absolute TSR \| Three Year Period
Stock-based compensation
Service period					3 years	3 years
PSU Awards Based On Relative TSR
Stock-based compensation
Number of performance periods \| item						3
Number of cumulative performance periods \| item						1
Service period						3 years			3 years	3 years
Amortization period of PSU expense						3 years
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent	150.00%								0.00%	0.00%
PSU Awards Based On Relative TSR \| Minimum
Stock-based compensation
Number of PSUs that may vest, as a percent						0.00%
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent									0.00%	0.00%
PSU Awards Based On Relative TSR \| Maximum
Stock-based compensation
Number of PSUs that may vest, as a percent						150.00%
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent									200.00%	200.00%
PSU Awards Based On Relative TSR \| One Year Period
Stock-based compensation
Service period						1 year
PSU Awards Based On Relative TSR \| Three Year Period
Stock-based compensation
Service period						3 years
PSU Awards Based On Leverage Ratio
Stock-based compensation
Number of performance periods \| item		3
Service period		1 year
PSU Awards Based On Leverage Ratio \| Minimum
Stock-based compensation
Number of PSUs that may vest, as a percent		0.00%
PSU Awards Based On Leverage Ratio \| Maximum
Stock-based compensation
Number of PSUs that may vest, as a percent		200.00%
Price target performance share unit awards
Stock-based compensation
Number of successive days closing stock price must achieve specific thresholds for PSUs to vest per schedule										10 days
Service period										3 years
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent										33.33%
Price target performance share unit awards \| Vesting before first anniversary
Stock-based compensation
Number of PSUs that may vest, as a percent										0.00%
Price target performance share unit awards \| Vesting before the second anniversary \| Maximum
Stock-based compensation
Number of PSUs that may vest, as a percent										33.33%
Price target performance share unit awards \| Vesting before the third anniversary \| Maximum
Stock-based compensation
Number of PSUs that may vest, as a percent										66.67%
TSR performance share unit awards \| Maximum
Stock-based compensation
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent					200.00%
ROCE performance share unit awards
Stock-based compensation
Service period								3 years
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent								0.00%
ROCE performance share unit awards \| Minimum
Stock-based compensation
Number of PSUs that may vest, as a percent								0.00%
ROCE performance share unit awards \| Maximum
Stock-based compensation
Number of PSUs that may vest, as a percent								200.00%