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Pension and Other Post-retirement Benefits Changes in Benefit Obligations and Plan Assets (Details) - USD ($) | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2020
Projected benefit obligation: |  |  |  |
BALANCE at the beginning of the period | $ 902,600,000 | $ 840,900,000 | $ 843,500,000 |
Interest cost | 6,600,000 | 15,600,000 | 22,400,000 | $ 25,400,000
Service cost | 0 | 0 | 0 | 100,000
Actuarial loss (gain) | (56,000,000.0) | 16,400,000 | (194,800,000) |
Plan settlements | 0 | (25,900,000) | (1,400,000) |
Curtailment gain recognized (2) | 0 | 0 | 0 | (3,300,000)
Plan amendments |  | 200,000 | 0 |
Benefits paid | (12,300,000) | (26,000,000.0) | (46,600,000) |
Net transfer in (including the effect of any business combinations/divestitures) |  | 22,300,000 | 0 |
BALANCE at the end of the period | 840,900,000 | 843,500,000 | 623,100,000 | 902,600,000
Plan assets |  |  |  |
Fair value, at the beginning of the period | 603,100,000 | 652,000,000.0 | 634,600,000 |
Actual return | 38,500,000 | 31,800,000 | (132,200,000) |
Employer contributions | 22,500,000 | 2,400,000 | 3,500,000 |
Foreign currency adjustments | 12,100,000 | 25,700,000 | 46,000,000.0 |
Fair value, at the end of the period | 652,000,000.0 | 634,600,000 | 458,500,000 | 603,100,000
Accumulated contributions less than net periodic benefit cost | (188,900,000) | (199,800,000) | (179,300,000) |
Amounts recognized in Consolidated Balance Sheet: |  |  |  |
Accrued liabilities | (2,800,000) | (4,900,000) | (4,800,000) |
Other liabilities (long-term) | (186,100,000) | (204,000,000.0) | (159,800,000) |
Net benefit liabilities | (188,900,000) | (208,900,000) | (164,600,000) |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |
Actuarial gain (loss) | 0 | (8,900,000) | 14,900,000 |
Prior service cost | 0 | (200,000) | (200,000) |
Total accumulated other comprehensive income (loss) | $ 0 | $ (9,100,000) | $ 14,700,000 |
Weighted-average assumptions: |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.81% |  |  |
Cash balance interest credit rate | 2.94% | 3.05% | 3.23% |
Savings Plan [Member] |  |  |  |
Plan assets |  |  |  |
Employer contributions |  |  |  | 8,800,000
Pension Benefits |  |  |  |
Projected benefit obligation: |  |  |  |
BALANCE at the beginning of the period | $ 886,700,000 | $ 826,100,000 | $ 827,900,000 |
Interest cost | 6,500,000 | 15,300,000 | 22,000,000.0 |
Actuarial loss (gain) | (55,000,000.0) | 20,600,000 | (191,000,000.0) |
Plan settlements | 0 | (25,900,000) | (1,400,000) |
Plan amendments |  | 200,000 | 0 |
Foreign currency adjustments | (12,100,000) | (25,700,000) | (46,000,000.0) |
Net transfer in (including the effect of any business combinations/divestitures) |  | 17,300,000 | 0 |
BALANCE at the end of the period | 826,100,000 | 827,900,000 | 611,500,000 | 886,700,000
Plan assets |  |  |  |
Fair value, at the beginning of the period | 603,100,000 | 652,000,000.0 | 634,600,000 |
Actual return | 38,500,000 | 31,800,000 | (132,200,000) |
Employer contributions | 22,500,000 | 2,400,000 | 3,500,000 |
Foreign currency adjustments | 12,100,000 | 25,700,000 | 46,000,000.0 |
Fair value, at the end of the period | 652,000,000.0 | 634,600,000 | 458,500,000 | 603,100,000
Accumulated contributions less than net periodic benefit cost | (174,100,000) | (180,000,000.0) | (159,800,000) |
Amounts recognized in Consolidated Balance Sheet: |  |  |  |
Accrued liabilities | (1,400,000) | (3,800,000) | (3,700,000) |
Other liabilities (long-term) | (172,700,000) | (189,500,000) | (149,300,000) |
Net benefit liabilities | (174,100,000) | (193,300,000) | (153,000,000.0) |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |
Actuarial gain (loss) | 0 | (13,100,000) | 7,000,000.0 |
Prior service cost | 0 | (200,000) | (200,000) |
Total accumulated other comprehensive income (loss) | $ 0 | $ (13,300,000) | $ 6,800,000 |
Weighted-average assumptions: |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.84% | 2.73% | 5.21% |
Other Benefits |  |  |  |
Projected benefit obligation: |  |  |  |
BALANCE at the beginning of the period | $ 15,900,000 | $ 14,800,000 | $ 15,600,000 |
Interest cost | 100,000 | 300,000 | 400,000 |
Actuarial loss (gain) | (1,000,000.0) | (4,200,000) | (3,800,000) |
Foreign currency adjustments | (200,000) | (300,000) | (600,000) |
Net transfer in (including the effect of any business combinations/divestitures) |  | 5,000,000.0 | 0 |
BALANCE at the end of the period | 14,800,000 | 15,600,000 | 11,600,000 | 15,900,000
Plan assets |  |  |  |
Fair value, at the beginning of the period | 0 | 0 | 0 |
Actual return | 0 | 0 | 0 |
Employer contributions | 0 | 0 | 0 |
Foreign currency adjustments | 0 | 0 | 0 |
Fair value, at the end of the period | 0 | 0 | 0 | $ 0
Accumulated contributions less than net periodic benefit cost | (14,800,000) | (19,800,000) | (19,500,000) |
Amounts recognized in Consolidated Balance Sheet: |  |  |  |
Accrued liabilities | (1,400,000) | (1,100,000) | (1,100,000) |
Other liabilities (long-term) | (13,400,000) | (14,500,000) | (10,500,000) |
Net benefit liabilities | (14,800,000) | (15,600,000) | (11,600,000) |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |
Actuarial gain (loss) | 0 | 4,200,000 | 7,900,000 |
Prior service cost | 0 | 0 | 0 |
Total accumulated other comprehensive income (loss) | $ 0 | $ 4,200,000 | $ 7,900,000 |
Weighted-average assumptions: |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.73% | 2.72% | 5.30% |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + 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 (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + 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 (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (a)(6) -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 60 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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