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FAIR VALUE MEASUREMENTS - Estimated FV (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended		12 Months Ended
	Oct. 01, 2019	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 02, 2019	Feb. 15, 2018	Jul. 10, 2017	Feb. 16, 2017
Fair value measurements
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor	Successor	Predecessor	Predecessor	Successor	Successor	Predecessor
12.0% senior secured second lien notes due 2022
Fair value measurements
Interest rate (as a percent)										12.00%
6.75% senior notes due 2025
Fair value measurements
Interest rate (as a percent)					6.75%			6.75%	6.75%	6.75%	6.75%
Principal amount										$ 850.0	$ 850.0
Total
Fair value measurements
Financial Designation, Predecessor and Successor [Fixed List]					Successor

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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+ References

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-Publisher FASB
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-Topic 852
-SubTopic 10
-Section 45
-Paragraph 27
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