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Fresh Start Accounting - Schedule of Enterprise Value (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Enterprise Value	$ 1,860.0
Cash and cash equivalents	607.6	$ 608.7	$ 325.8
Long-term Debt, Fair Value	(544.8)
Warrants and Rights Outstanding	(16.4)	(16.4)	0.0
Stockholders' Equity Attributable to Noncontrolling Interest	1.1	$ (2.7)	$ 4.3
Liability, Other Postretirement Defined Benefit Plan, Noncurrent	(189.0)
Other Liabilities	(639.0)
Stockholders' Equity Attributable To Parent, Successor	$ (1,079.5)
Stock Issued During Period, Shares, New Issues	75
Common Stock, Par or Stated Value Per Share	$ 14.39	$ 0.01

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