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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2022
Stockholders' Equity Note [Abstract] |
Schedule Of Activity In Our Various Shareholders' Equity | Activity in our various shareholders' equity accounts for the year ended December 31, 2022 (Successor), the eight months ended December 31, 2021 (Successor), the four months ended April 30, 2021 (Predecessor) and the year ended December 31, 2020 (Predecessor) were as follows (in millions):
| Shares |  | Par Value |  | Additional Paid-in Capital |  | Warrants |  | Retained Earnings (Deficit) |  | AOCI |  | Treasury Shares |  | Non-controlling Interest
BALANCE, December 31, 2019 (Predecessor) | 205.9 |  |  | $ | 82.5 |  |  | $ | 8,627.8 |  |  | $ | — |  |  | $ | 671.7 |  |  | $ | 6.2 |  |  | $ | (77.3) |  |  | $ | (1.3) |
Net loss | — |  |  | — |  |  | — |  |  | — |  |  | (4,855.5) |  |  | — |  |  | — |  |  | (2.1) |
Net changes in pension and other postretirement benefits | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (76.5) |  |  | — |  |  | — |
Purchase of noncontrolling interests | — |  |  | — |  |  | (7.2) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Distributions to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (0.9) |
Shares issued under share-based compensation plans, net | 0.2 |  |  | 0.1 |  |  | (1.9) |  |  | — |  |  | — |  |  | — |  |  | 2.0 |  |  | — |
Repurchase of shares | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (0.9) |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 21.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (17.6) |  |  | — |  |  | — |
BALANCE, December 31, 2020 (Predecessor) | 206.1 |  |  | 82.6 |  |  | 8,639.9 |  |  | — |  |  | (4,183.8) |  |  | (87.9) |  |  | (76.2) |  |  | (4.3) |
Net income (loss) | — |  |  | — |  |  | — |  |  | — |  |  | (4,467.0) |  |  | — |  |  | — |  |  | 3.2 |
Shares issued under share-based compensation plans, net | — |  |  | — |  |  | (0.7) |  |  | — |  |  | — |  |  | — |  |  | 0.7 |  |  | — |
Net changes in pension and other postretirement benefits | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 4.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net other comprehensive loss | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (5.6) |  |  | — |  |  | — |
Cancellation of Predecessor equity | (206.1) |  |  | (82.6) |  |  | (8,644.0) |  |  | — |  |  | 8,650.8 |  |  | 93.4 |  |  | 75.5 |  |  | — |
Issuance of Successor Common Shares and Warrants | 75.0 |  |  | 0.8 |  |  | 1,078.7 |  |  | 16.4 |  |  | — |  |  | — |  |  | — |  |  | — |
BALANCE, April 30, 2021 (Predecessor) | 75.0 |  |  | 0.8 |  |  | 1,078.7 |  |  | 16.4 |  |  | — |  |  | — |  |  | — |  |  | (1.1) |
BALANCE, May 1, 2021 (Successor) | 75.0 |  |  | 0.8 |  |  | 1,078.7 |  |  | 16.4 |  |  | — |  |  | — |  |  | — |  |  | (1.1) |
Adjustment to unrecognized tax benefits | — |  |  | — |  |  | — |  |  | — |  |  | 11.0 |  |  | — |  |  | — |  |  | — |
Net income (loss) | — |  |  | — |  |  | — |  |  | — |  |  | (27.4) |  |  | — |  |  | — |  |  | 3.8 |
Net changes in pension and other postretirement benefits | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (9.1) |  |  | — |  |  | — |
Share-based compensation cost | — |  |  | — |  |  | 4.3 |  |  |  |  | — |  |  | — |  |  | — |  |  | — |
BALANCE, December 31, 2021 (Successor) | 75.0 |  |  | 0.8 |  |  | 1,083.0 |  |  | 16.4 |  |  | (16.4) |  |  | (9.1) |  |  | — |  |  | 2.7 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | 176.5 |  |  | — |  |  | — |  |  | 5.3 |
Share-based compensation cost | — |  |  | — |  |  | 17.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Shares issued under share-based compensation plans, net | 0.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net changes in pension and other postretirement benefits | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 23.8 |  |  | — |  |  | — |
Shares withheld for taxes on vesting of share-based awards | — |  |  | — |  |  | (2.5) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
BALANCE, December 31, 2022 (Successor) | 75.2 |  |  | $ | 0.8 |  |  | $ | 1,097.9 |  |  | $ | 16.4 |  |  | $ | 160.1 |  |  | $ | 14.7 |  |  | $ | — |  |  | $ | 8.0 |

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