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Pension and Other Post-retirement Benefits Changes in Benefit Obligations and Plan Assets (Details) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2020 | Apr. 11, 2019
Projected benefit obligation: |  |  |  |
Balance, January 1 and April 11 |  | $ 816,000,000.0 | $ 848,500,000 |
Interest cost | $ 21,300,000 | 21,700,000 | 25,400,000 |
Service cost | 1,500,000 | 1,500,000 | 100,000 |
Actuarial loss (gain) |  | 44,000,000.0 | 97,700,000 |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  |  | (6,600,000) |
Benefits paid | (34,500,000) |  | (59,200,000) |
Foreign currency adjustments | 200,000 |  |  |
Balance, December 31 | 848,500,000 | 848,500,000 | 902,600,000 |
Plan assets |  |  |  |
Fair value, January 1 and April 11 |  | 576,800,000 | 598,900,000 |
Actual return |  | 43,600,000 | 57,900,000 |
Employer contributions |  | 12,800,000 | 11,500,000 |
Foreign currency adjustments | (200,000) | 34,100,000 | 58,600,000 |
Fair value, December 31 | 598,900,000 | 598,900,000 | 603,100,000 |
Accumulated contributions in excess of (less than) net periodic benefit cost | (222,100,000) | (222,100,000) | (195,400,000) |
Amounts recognized in consolidated balance sheet: |  |  |  |
Accrued liabilities | (2,900,000) | (2,900,000) | (2,900,000) | $ (19,200,000)
Other liabilities (long-term) | (246,700,000) | (246,700,000) | (296,600,000) |
Net benefit liabilities | (249,600,000) | (249,600,000) | (299,500,000) | (239,300,000)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |
Actuarial loss | (27,500,000) | (27,500,000) | (104,100,000) |
Total accumulated other comprehensive loss | $ (27,500,000) | $ (27,500,000) | $ (104,100,000) |
Weighted-average assumptions: |  |  |  |
Cash balance interest credit rate | 3.29% | 3.29% | 2.94% |
Curtailment gain recognized (2) | $ 0 |  | $ (3,300,000) |
Pension Benefits |  |  |  |
Projected benefit obligation: |  |  |  |
Balance, January 1 and April 11 |  | $ 800,100,000 | 832,400,000 |
Interest cost |  | 21,300,000 | 24,900,000 |
Service cost |  | 1,500,000 | 100,000 |
Actuarial loss (gain) |  | 43,800,000 | 97,800,000 |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  |  | (6,600,000) |
Benefits paid |  | (200,000) | 0 |
Foreign currency adjustments |  | (34,100,000) | (58,600,000) |
Balance, December 31 | 832,400,000 | 832,400,000 | 886,700,000 |
Plan assets |  |  |  |
Fair value, January 1 and April 11 |  | 576,800,000 | 598,900,000 |
Actual return |  | 43,600,000 | 57,900,000 |
Employer contributions |  | 12,800,000 | 11,500,000 |
Benefits paid |  | (200,000) | 0 |
Foreign currency adjustments |  | 34,100,000 | 58,600,000 |
Fair value, December 31 | 598,900,000 | 598,900,000 | 603,100,000 |
Accumulated contributions in excess of (less than) net periodic benefit cost | (206,200,000) | (206,200,000) | (179,600,000) |
Amounts recognized in consolidated balance sheet: |  |  |  |
Accrued liabilities | (1,400,000) | (1,400,000) | (1,500,000) |
Other liabilities (long-term) | (232,100,000) | (232,100,000) | (282,100,000) |
Net benefit liabilities | (233,500,000) | (233,500,000) | (283,600,000) | $ (202,100,000)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |
Actuarial loss | (27,300,000) | (27,300,000) | (104,000,000.0) |
Total accumulated other comprehensive loss | $ (27,300,000) | $ (27,300,000) | $ (104,000,000.0) |
Weighted-average assumptions: |  |  |  |
Discount rate | 3.16% | 3.16% | 2.30% |
Curtailment gain recognized (2) |  |  | $ (3,300,000) |
Other Benefits |  |  |  |
Projected benefit obligation: |  |  |  |
Balance, January 1 and April 11 |  | $ 15,900,000 | 16,100,000 |
Interest cost |  | 400,000 | 500,000 |
Service cost |  | 0 | 0 |
Actuarial loss (gain) |  | 200,000 | (100,000) |
Benefits paid |  | 0 | 0 |
Foreign currency adjustments |  | (400,000) | (600,000) |
Balance, December 31 | $ 16,100,000 | 16,100,000 | 15,900,000 |
Plan assets |  |  |  |
Fair value, January 1 and April 11 |  | 0 | 0 |
Actual return |  | 0 | 0 |
Employer contributions |  | 0 | 0 |
Benefits paid |  | 0 | 0 |
Foreign currency adjustments |  | 0 | 0 |
Fair value, December 31 | 0 | 0 | 0 |
Accumulated contributions in excess of (less than) net periodic benefit cost | (15,900,000) | (15,900,000) | (15,800,000) |
Amounts recognized in consolidated balance sheet: |  |  |  |
Accrued liabilities | (1,500,000) | (1,500,000) | (1,400,000) |
Other liabilities (long-term) | (14,600,000) | (14,600,000) | (14,500,000) |
Net benefit liabilities | (16,100,000) | (16,100,000) | (15,900,000) |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |
Actuarial loss | (200,000) | (200,000) | (100,000) |
Total accumulated other comprehensive loss | $ (200,000) | $ (200,000) | $ (100,000) |
Weighted-average assumptions: |  |  |  |
Discount rate | 3.06% | 3.06% | 2.19% |

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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 http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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