FRESH START ACCOUNTING - Fair Value of Successor Common Shares (Details) - USD ($) $ in Millions	Dec. 31, 2023	Aug. 12, 2023	Aug. 11, 2023	Dec. 31, 2022
Reorganizations [Abstract]
Enterprise value			$ 2,150.0
Plus: Excess cash available for operations			206.1
Less: Fair value of Exit Facility	$ (1,285.5)		(1,250.0)	$ (1,819.7)
Less: Net pension, post-retirement and other benefits liability			(39.3)
Less: Other debt			(13.9)
Less: Noncontrolling interests	$ (15.4)	$ (13.9)	(13.9)	$ (9.8)
Fair Value of Successor Equity			$ 1,039.0