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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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