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Pension and Other Post-retirement Benefits Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Apr. 11, 2019 | Dec. 31, 2018
Projected benefit obligation: |  |  |  |
Balance, April 11 |  | $ 816.0 |  |
Interest cost |  | 21.7 |  |
Service cost |  | 1.5 |  |
Actuarial loss |  | 44.0 |  |
Benefits paid |  | (34.5) |  |
Foreign currency adjustments |  | (0.2) |  |
Balance, December 31 | $ 848.5 | 848.5 |  |
Plan assets |  |  |  |
Fair value, April 11 |  | 576.8 |  |
Actual return |  | 43.6 |  |
Employer contributions |  | 12.8 |  |
Benefits paid |  | (34.1) |  |
Foreign currency adjustments |  | 0.2 |  |
Fair value, December 31 | 598.9 | 598.9 |  |
Amounts recognized in consolidated balance sheet: |  |  |  |
Accrued liabilities | (2.9) | (2.9) | $ (19.2) |
Other liabilities (long-term) | (246.7) | (246.7) |  | $ 0.0
Net benefit liabilities | (249.6) | (249.6) | (239.3) |
Accumulated contributions in excess of (less than) net periodic benefit cost | (222.1) | (222.1) |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |
Actuarial loss | (27.5) | (27.5) |  |
Total accumulated other comprehensive loss | (27.5) | (27.5) |  |
Pension Benefits |  |  |  |
Projected benefit obligation: |  |  |  |
Balance, April 11 |  | 800.1 |  |
Interest cost | 21.3 | 21.3 |  |
Service cost | 1.5 | 1.5 |  |
Actuarial loss |  | 43.8 |  |
Benefits paid |  | (34.1) |  |
Foreign currency adjustments |  | (0.2) |  |
Balance, December 31 | 832.4 | 832.4 |  |
Plan assets |  |  |  |
Fair value, April 11 |  | 576.8 |  |
Actual return |  | 43.6 |  |
Employer contributions |  | 12.8 |  |
Benefits paid |  | (34.1) |  |
Foreign currency adjustments |  | 0.2 |  |
Fair value, December 31 | 598.9 | 598.9 |  |
Amounts recognized in consolidated balance sheet: |  |  |  |
Accrued liabilities | (1.4) | (1.4) |  |
Other liabilities (long-term) | (232.1) | (232.1) |  |
Net benefit liabilities | (233.5) | (233.5) | $ (202.1) |
Accumulated contributions in excess of (less than) net periodic benefit cost | (206.2) | (206.2) |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |
Actuarial loss | (27.3) | (27.3) |  |
Total accumulated other comprehensive loss | $ (27.3) | $ (27.3) |  |
Weighted-average assumptions: |  |  |  |
Discount rate | 3.16% | 3.16% |  |
Rate of compensation increase | 0.00% | 0.00% |  |
Other Benefits |  |  |  |
Projected benefit obligation: |  |  |  |
Balance, April 11 |  | $ 15.9 |  |
Interest cost |  | 0.4 |  |
Service cost |  | 0.0 |  |
Actuarial loss |  | 0.2 |  |
Benefits paid |  | (0.4) |  |
Foreign currency adjustments |  | 0.0 |  |
Balance, December 31 | $ 16.1 | 16.1 |  |
Plan assets |  |  |  |
Fair value, 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 | 0.0 |  |
Amounts recognized in consolidated balance sheet: |  |  |  |
Accrued liabilities | (1.5) | (1.5) |  |
Other liabilities (long-term) | (14.6) | (14.6) |  |
Net benefit liabilities | (16.1) | (16.1) |  |
Accumulated contributions in excess of (less than) net periodic benefit cost | (15.9) | (15.9) |  |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |  |
Actuarial loss | (0.2) | (0.2) |  |
Total accumulated other comprehensive loss | $ (0.2) | $ (0.2) |  |
Weighted-average assumptions: |  |  |  |
Discount rate | 3.06% | 3.06% |  |
Rate of compensation increase | 0.00% | 0.00% |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118930883&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 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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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- References No definition available. + Details
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- Details
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