Fresh-Start Accounting - Implied Fair Value (Details) - USD ($) $ in Millions	Nov. 14, 2023	Jun. 16, 2022
Reorganization, Chapter 11 [Line Items]
Enterprise Value	$ 2,950.0	$ 5,223.0
Enterprise Value Adjustments		197.0
Adjusted Enterprise Value	2,950.0	5,420.0
Reorganization Value, Present Value of Discounted Cash Flows of Emerging Entity	1,194.8	2,203.6
Reorganization Value	3,816.9	6,602.3
Median
Reorganization, Chapter 11 [Line Items]
Enterprise Value	2,950.0	5,450.0
Minimum
Reorganization, Chapter 11 [Line Items]
Enterprise Value	2,700.0	5,200.0
Maximum
Reorganization, Chapter 11 [Line Items]
Enterprise Value	3,200.0	5,700.0
Cash and Cash Equivalents
Reorganization, Chapter 11 [Line Items]
Adjustments to Enterprise Value		297.9
Non-operating assets, net
Reorganization, Chapter 11 [Line Items]
Adjustments to Enterprise Value	290.0	178.7
Debt, fair value
Reorganization, Chapter 11 [Line Items]
Adjustments to Enterprise Value	(1,882.7)	(3,067.2)
Other Liabilities, Fair Value
Reorganization, Chapter 11 [Line Items]
Adjustments to Enterprise Value	(162.5)	(625.8)
Other current liabilities
Reorganization, Chapter 11 [Line Items]
Adjustments to Enterprise Value	404.8	522.5
Other Noncurrent Liabilities
Reorganization, Chapter 11 [Line Items]
Adjustments to Enterprise Value	172.1	183.2
Equity | Median
Reorganization, Chapter 11 [Line Items]
Enterprise Value	1,360.0	813.0
Equity | Minimum
Reorganization, Chapter 11 [Line Items]
Enterprise Value	1,110.0	563.0
Equity | Maximum
Reorganization, Chapter 11 [Line Items]
Enterprise Value	$ 1,610.0	$ 1,063.0