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v3.22.4

Pension and Other Post-retirement Benefits Net Periodic Pension Costs and Weighted Average Assumptions (Details) - USD ($) $ in Millions |  | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.1
Interest cost |  | 6.6 | 15.6 | 22.4 | 25.4
Expected return on plan assets |  | (12.1) | (24.7) | (38.3) | (36.5)
Curtailment gain recognized (2) |  | 0.0 | 0.0 | 0.0 | (3.3)
Settlement (gain) loss recognized (2) |  | 0.0 | 0.4 | (0.4) | (0.3)
Defined Benefit Plan, Amortization of Gain (Loss) |  | 0.1 | 0.0 | (0.1) | 0.0
Net periodic pension costs |  | $ (5.4) | $ (8.7) | $ (16.4) | $ (14.6)
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%
Cash balance interest credit rate |  | 2.94% | 2.94% | 3.05% | 3.29%
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Interest cost |  | $ 6.5 | $ 15.3 | $ 22.0 |
Discount rate |  | 2.30% | 2.84% | 2.73% | 3.16%

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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