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Pension and Other Postretirement Benefits Pension Narrative (Details) - USD ($) $ in Millions |  |  | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2023 | Apr. 30, 2021 | Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Net benefit liabilities |  | $ 188.9 | $ 188.9 | $ 208.9 | $ 164.6 | $ 208.9 |  |
Net projected benefit obligations, current |  | $ 2.8 | $ 2.8 | $ 4.9 | $ 4.8 | 4.9 |  |
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% | 6.26% |  | 6.48% |
Liability, Defined Benefit Plan, Noncurrent |  | $ 186.1 | $ 186.1 | $ 204.0 | $ 159.8 | 204.0 |  |
Employer contributions |  |  | 22.5 | 2.4 | 3.5 |  |  |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets |  |  | 12.1 | 24.7 | 38.3 |  | $ 36.5 |
Defined Benefit Plan, Plan Assets, Amount |  | 652.0 | 652.0 | 634.6 | 458.5 | $ 634.6 | 603.1 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change |  |  |  |  | 29.3 |  |  |
Interest cost |  |  | 6.6 | 15.6 | 22.4 |  | 25.4 |
Forecast [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  |  |  |  |  |  | $ 1.2
Mr. Joseph Goldschmid |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Related Party |  |  |  |  | $ 4.7 |  |  |
Savings Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Employer contributions |  |  |  |  |  |  | $ 8.8 |
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 |  |  |  |  | 7.10% |  |  |
Maximum | Savings Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Maximum percentage of eligible employee compensation to be matched by employer |  |  |  |  | 4.00% |  | 5.00% |
Maximum | Savings Plan [Member] | Subsequent Event |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 6.26% |  |
Defined Benefit Plan, Underfunded Plan |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Unfunded obligation increase |  |  |  |  | $ (44.3) |  |  |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets |  |  |  |  | 132.2 |  |  |
Interest cost |  |  |  |  | 22.4 |  |  |
Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Net benefit liabilities |  | 174.1 | 174.1 | 193.3 | 153.0 | $ 193.3 |  |
Net projected benefit obligations, current |  | 1.4 | 1.4 | 3.8 | 3.7 | 3.8 |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  |  |  |  | 7.4 |  |  |
Liability, Defined Benefit Plan, Noncurrent |  | 172.7 | 172.7 | 189.5 | 149.3 | 189.5 |  |
Employer contributions |  |  | 22.5 | 2.4 | 3.5 |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 652.0 | 652.0 | 634.6 | 458.5 | 634.6 | $ 603.1 |
Interest cost |  |  | 6.5 | $ 15.3 | 22.0 |  |  |
Supplemental Executive Retirement Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Unfunded obligation increase |  |  |  |  | $ 170.1 |  |  |
Change in unrealized gains (losses) included in other income |  |  | $ 1.2 |  |  | $ 3.2 |  |

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