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OTHER INFORMATION - Narrative (Details) - USD ($) $ in Millions	8 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2018
Other Income and Expenses [Abstract]
Expenses incurred related to capital structure	$ (26.5)	$ (6.3)	$ 23.1

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- Definition

Restructuring Costs, Negotiations With Lenders And Other Activities

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No definition available.

+ Details

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Namespace Prefix:	cik0001400891_
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Balance Type:	debit
Period Type:	duration

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No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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