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Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Sep. 30, 2022 | Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
BALANCE |  |  |  | $ 1,094.8 | $ 1,077.4 |
Net income (loss) |  |  | $ (4,463.8) | (23.6) | 181.8 | $ (4,857.6)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  | 4.8 | 4.3 | 17.4 | 7.2
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits |  |  | (0.1) | 9.1 | (23.8) | 76.3
Net other comprehensive income (loss) |  |  | (5.5) | (9.1) | 23.8 | $ (94.1)
BALANCE | $ 1,094.8 |  | $ 1,094.8 | $ 1,077.4 | 1,297.9 |
Stock Issued During Period, Shares, New Issues | 75.0 |  |  |  |  |
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  | $ (2.5) |
Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation |  | 100.0 |  |  | 0.0 |
Common Stock [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
BALANCE, shares |  |  | 206.1 | 75.0 | 75.0 | 205.9
BALANCE |  |  | $ 82.6 | $ 0.8 | $ 0.8 | $ 82.5
Stock Issued During Period, Value, New Issues |  |  | $ 0.8 |  |  |
Shares Issued Under Share Based Compensation Plans, Shares |  |  |  |  | 0.2 | 0.2
BALANCE, shares | 75.0 |  | 75.0 | 75.0 | 75.2 | 206.1
BALANCE | $ 0.8 |  | $ 0.8 | $ 0.8 | $ 0.8 | $ 82.6
Shares Issued Under Share Based Compensation Plans, Amount |  |  |  |  |  | (0.1)
Cancellation Of Predecessor Equity, Shares |  |  | (206.1) |  |  |
Cancellation Of Predecessor Equity, Value |  |  | $ (82.6) |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 75.0 |  |  |
Additional Paid-In Capital [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
BALANCE |  |  | $ 8,639.9 | 1,078.7 | 1,083.0 | 8,627.8
Stock Issued During Period, Value, New Issues |  |  | 1,078.7 |  |  |
Share-based compensation cost |  |  |  |  |  | 21.2
BALANCE | 1,078.7 |  | 1,078.7 | 1,083.0 | 1,097.9 | 8,639.9
Shares Issued Under Share Based Compensation Plans, Amount |  |  | (0.7) |  |  | (1.9)
Cancellation Of Predecessor Equity, Value |  |  | (8,644.0) |  |  |
Retained Earnings [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
BALANCE |  |  | (4,183.8) | 0.0 | (16.4) | 671.7
Net income (loss) |  |  | (4,467.0) | (27.4) | 176.5 | (4,855.5)
BALANCE | 0.0 |  | 0.0 | (16.4) | 160.1 | (4,183.8)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  |  | 11.0 |  |
Cancellation Of Predecessor Equity, Value |  |  | 8,650.8 |  |  |
AOCI [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
BALANCE |  |  | (87.9) | 0.0 | (9.1) | 6.2
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits |  |  | 0.1 |  |  | (76.5)
Net other comprehensive income (loss) |  |  | (5.6) | (9.1) | 23.8 | (17.6)
BALANCE | 0.0 |  | 0.0 | (9.1) | 14.7 | (87.9)
Cancellation Of Predecessor Equity, Value |  |  | 93.4 |  |  |
Treasury Shares [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
BALANCE |  |  | (76.2) | 0.0 | 0.0 | (77.3)
Repurchase of shares |  |  |  |  |  | (0.9)
BALANCE | 0.0 |  | 0.0 | 0.0 | 0.0 | (76.2)
Shares Issued Under Share Based Compensation Plans, Amount |  |  | (0.7) |  |  | (2.0)
Cancellation Of Predecessor Equity, Value |  |  | 75.5 |  |  |
Noncontrolling Interest [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
BALANCE |  |  | (4.3) | (1.1) | 2.7 | (1.3)
Net income (loss) |  |  | 3.2 | 3.8 | 5.3 | (2.1)
Distributions to noncontrolling interests |  |  |  |  |  | (0.9)
BALANCE | (1.1) |  | (1.1) | 2.7 | 8.0 | (4.3)
Warrant |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
BALANCE |  |  | 0.0 | 16.4 | 16.4 | 0.0
Stock Issued During Period, Value, New Issues |  |  | 16.4 |  |  |
BALANCE | $ 16.4 |  | $ 16.4 | $ 16.4 | $ 16.4 | $ 0.0

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