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Pension and Other Postretirement Benefits Pension Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 4 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2021 | Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Net benefit liabilities | $ 188.9 | $ 188.9 | $ 188.9 | $ 208.9 |  | $ 208.9 | $ 299.5 |
Net projected benefit obligations, current | $ 2.8 | 2.8 | $ 2.8 | $ 4.9 |  | 4.9 | $ 2.9 |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 6.03% |  | 6.03% | 6.03% | 6.70% |  | 6.48% |
Unfunded obligation increase |  | (110.6) | $ 9.2 | $ 13.2 |  |  |  |
Liability, Defined Benefit Plan, Noncurrent | $ 186.1 | 186.1 | 186.1 | 204.0 |  | $ 204.0 | $ 296.6 |
Employer contributions |  |  | 22.5 | 2.4 |  |  | 11.5 |
Defined Benefit Plan, Increase (Decrease) Due To Increase In Discount Rate | 56.0 |  |  |  |  |  |  |
Defined Benefit Plan, Increase (Decrease) Due To Return On Plan Assets | 26.0 |  |  |  |  |  |  |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets |  |  | 12.1 | 24.7 | $ 27.1 |  | 36.5 |
Savings Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Employer contributions |  |  |  |  |  |  | $ 8.8 | $ 18.7
Employee match |  |  |  |  |  | 100.00% |  |
Maximum |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |  |  |  |  |  | 6.26% |  |
Maximum | Savings Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Maximum percentage of eligible employee compensation to be matched by employer |  |  |  |  |  | 5.00% |  |
Minimum |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |  |  |  |  |  |  | 6.03% |
Defined Benefit Plan, Underfunded Plan |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Unfunded obligation increase |  |  |  |  |  | $ 20.0 |  |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets |  |  |  | 7.1 |  |  |  |
Reorganization, Chapter 11, Fresh-Start Adjustment |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Liability, Defined Benefit Plan, Noncurrent | 82.7 | 82.7 | 82.7 |  |  |  |  |
Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Net benefit liabilities | 174.1 | 174.1 | 174.1 | 193.3 |  | 193.3 | $ 283.6 |
Net projected benefit obligations, current | 1.4 | 1.4 | 1.4 | 3.8 |  | 3.8 | 1.5 |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  |  |  | 3.8 |  | 3.8 |  |
Liability, Defined Benefit Plan, Noncurrent | $ 172.7 | $ 172.7 | 172.7 | 189.5 |  | 189.5 | 282.1 |
Employer contributions |  |  | $ 22.5 | 2.4 |  |  | $ 11.5 |
Other Postretirement Benefits Plan |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  |  |  | 1.2 |  | $ 1.2 |  |
Supplemental Executive Retirement Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Unfunded obligation increase |  |  |  | $ 16.2 |  |  |  |

X
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