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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Employee Benefit Plans |
Schedule of funded status of the defined benefit plans and amounts recognized in the consolidated balance sheets | ​
​ | ​ | ​ | ​
​ |  | Year Ended
​ |  | December 31, 2023
​ | ​ | (in millions)
Change in projected benefit obligation | ​ | ​ | ​
Balance at beginning of period (October 23, 2023) | ​ | $ | 68.0
Service cost | ​ | ​ | —
Administration costs paid | ​ | ​ | —
Interest cost | ​ | ​ | 0.7
Actuarial loss (gain) | ​ | ​ | 5.5
Benefits paid | ​ | ​ | (0.7)
Balance at end of year | ​ | $ | 73.5
Change in fair value of plan assets | ​ | ​ | ​
Balance at beginning of period (October 23, 2023) | ​ | $ | 67.9
Actual gain (loss) on assets | ​ | ​ | 7.2
Employer contributions | ​ | ​ | —
Administration costs paid | ​ | ​ | —
Benefits paid | ​ | ​ | (0.7)
Fair value of plan assets at end of the year | ​ | $ | 74.4
Funded (underfunded) status at end of year | ​ | $ | 0.9
​
​ | ​ | ​ | ​
​ |  | December 31, 2023
​ | ​ | (in millions)
Current liabilities | ​ | $ | —
Noncurrent assets (liabilities) | ​ | ​ | 0.9
Net amount recognized | ​ | $ | 0.9
Schedule of amounts recognized in accumulated other comprehensive income | ​
​ | ​ | ​ | ​
​ |  | December 31, 2023
​ | ​ | (in millions)
Net actuarial gain recognized | ​ | $ | (0.9)
Schedule of the components of net periodic benefit cost | ​
​ | ​ | ​ | ​
​ |  | Year Ended
​ |  | December 31, 2023
​ | ​ | (in millions)
Service cost - benefits earned | ​ | $ | —
Interest costs on benefit obligation | ​ | ​ | 0.7
Expected return on assets | ​ | ​ | (0.7)
Net actuarial loss amortization | ​ | $ | —
Net periodic benefit cost | ​ | $ | —
Schedule of weighted average assumptions used to determine benefit obligations | ​
​ | ​ | ​ | ​
​ |  | December 31, 2023
​ | ​ | (in millions)
Discount rate | ​ | 4.64 | %
Schedule of weighted-average assumptions used to determine net periodic benefit costs | ​
​ | ​ | ​ | ​
​ |  | December 31, 2023
​ | ​ | (in millions)
Discount rate | ​ | 5.36 | %
Long-term rate of return on assets | ​ | 5.60 | %
Schedule of the weighted average asset allocations by asset category | ​
​ | ​ | ​ | ​
​ |  | December 31, 2023
​ | ​ | (in millions)
Asset Category | ​ | ​ | ​
Cash | ​ | 39 | %
Equity | ​ | - | ​
Fixed Income | ​ | 61 | ​
Total | ​ | 100 | %
Schedule of the investments in the pension plan measured at fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023
​ | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Total
​ | ​ | (in millions)
Cash | ​ | $ | 28.9 | ​ | $ | — | ​ | $ | — | ​ | $ | 28.9
Fixed income securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate notes | ​ | ​ | — | ​ | ​ | 31.7 | ​ | ​ | — | ​ | ​ | 31.7
Treasury notes | ​ | ​ | 12.7 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 12.7
Other investments(a) | ​ | $ | 1.7 | ​ | $ | — | ​ | $ | — | ​ | $ | 1.7
Total investments | ​ | $ | 43.3 | ​ | $ | 31.7 | ​ | $ | — | ​ | $ | 75.0
| (a) | Includes Aetna Co. Annuity Contract and accrued interest and dividends
Information related to the company's pension funds cash flow | ​
​ | ​ | ​ | ​
​ |  | Year Ended
​ |  | December 31, 2023
​ | ​ | (in millions)
Employer contributions | ​ | $ | —
Benefit payments | ​ | $ | 0.7
Schedule of expected benefit payments to be paid by the pension plans | ​
​ | ​ | ​ | ​
​ | ​ | (in millions)
During fiscal year ending December 31, 2024 | ​ | $ | 73.5
During fiscal year ending December 31, 2025 | ​ | ​ | N/A (1)
During fiscal year ending December 31, 2026 | ​ | ​ | N/A (1)
During fiscal year ending December 31, 2027 | ​ | ​ | N/A (1)
During fiscal year ending December 31, 2028 | ​ | ​ | N/A (1)
During fiscal year ending December 31, 2029 through December 31, 2033 | ​ | ​ | N/A (1)
| (1) | Benefits under the Pension Plan are expected to be distributed by December 31, 2024.

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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the actual allocation of plan assets and target allocations by asset class. + References No definition available. + Details
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