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Employee Benefit Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2021
Pension Plan |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost |  | $ 6.6 | $ 10.3 |
Interest cost |  | 16.6 | 17.0 |
Settlement |  |  | (135.4) |
Pension Benefits |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | $ 2.6 | 6.6 | 10.3 | $ 11.5
Interest cost | $ 4.3 | $ 16.6 | $ 17.0 | $ 16.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Expected return on plan assets | $ (5.3) | $ (19.4) | $ (20.6) | $ (19.8)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Amortization of prior service cost | $ 0.6 | $ 1.9 | $ 2.2 | $ 2.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Settlement |  |  | $ 33.6 |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |
Amortization of net actuarial (gain) loss | $ 0.2 | $ (2.4) | $ 1.0 | $ 4.9
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Expenses paid | $ 2.5 | $ 1.0 | $ 3.0 | $ 3.0
Net periodic benefit cost | 4.9 | 4.3 | 46.5 | 18.3
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Net actuarial (gain) loss | (13.0) | (12.5) | (26.2) | (74.1)
Amortization of prior service cost | (0.6) | (1.9) | (2.2) | (2.3)
Settlement |  |  | (33.6) |
Amortization of net actuarial gain (loss) | (0.2) | 2.4 | (1.0) | (4.9)
Total | $ (13.8) | $ (12.0) | $ (63.0) | $ (81.3)
Weighted-average assumptions |  |  |  |
Discount rate | 2.91% | 5.09% | 2.83% | 2.71%
Expected return on plan assets | 4.46% | 6.50% | 4.31% | 4.89%
Postretirement Health and Other |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | $ 0.5 | $ 1.7 | $ 2.2 | $ 2.2
Interest cost | $ 0.4 | $ 2.1 | $ 1.4 | $ 1.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Amortization of prior service cost | $ (0.4) | $ (1.4) | $ (1.4) | $ (1.4)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Amortization of net actuarial (gain) loss | $ 0.1 | $ (0.2) | $ 0.3 | $ 0.3
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Net periodic benefit cost | $ 0.6 | $ 2.2 | $ 2.5 | $ 2.3
Other changes in plan assets and benefit obligations recognized in other comprehensive income |  |  |  |
Net actuarial (gain) loss | 2.2 | 7.5 | (12.0) | (1.1)
Amortization of prior service cost | 0.4 | 1.4 | 1.4 | 1.4
Amortization of net actuarial gain (loss) | (0.1) | 0.2 | (0.3) | $ (0.3)
Total | $ 2.5 | $ 9.1 | $ (10.9) |
Weighted-average assumptions |  |  |  |
Discount rate | 2.61% | 4.95% | 2.62% | 2.36%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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