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Incentive and Deferred Compensation Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Oct. 01, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 31, 2016
Annual Incentive Plan |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |
Accrued bonuses |  |  |  |  |  | $ 6.6 |  |
Payments to employees | $ 8.7 |  |  |  |  |  |  |
Annual Incentive Plan | Minimum |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |
Incentive plans, payout percentages of target values |  |  |  |  |  | 0.00% |  |
Annual Incentive Plan | Maximum |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |
Incentive plans, payout percentages of target values |  |  |  |  |  | 200.00% |  |
Performance Incentive Plan | Minimum |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |
Incentive plans, payout percentages of target values |  |  |  |  |  |  |  | 0.00%
Performance Incentive Plan | Maximum |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |
Incentive plans, payout percentages of target values |  |  |  |  |  |  |  | 200.00%
Successor |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |
Deferred compensation plan assets to be distributed to participants |  |  |  |  |  |  | $ 5.1 |
Successor | Other Postretirement Benefits Plan |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |
Retirement plan, employer matching contribution, percent of match |  |  | 100.00% |  |  | 100.00% | 100.00% |
Retirement plan, employer matching contribution, percent of employees' gross pay (up to) |  |  | 10.00% |  |  | 10.00% | 10.00% |
Retirement plan, employer matching contribution, vesting period |  |  | 4 years |  |  | 4 years | 4 years |
Retirement plan, cost recognized |  |  | $ 0.9 |  |  | $ 2.8 | $ 3.6 |
Percent of employee contributions vesting immediately |  |  | 100.00% |  |  | 100.00% | 100.00% |
Successor | Performance Incentive Plan |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |
Payments to employees |  | $ 15.8 | $ 7.1 |  |  |  |  |
Predecessor | Other Postretirement Benefits Plan |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |
Retirement plan, employer matching contribution, percent of match |  |  |  |  | 100.00% |  |  |
Retirement plan, employer matching contribution, percent of employees' gross pay (up to) |  |  |  |  | 10.00% |  |  |
Retirement plan, employer matching contribution, vesting period |  |  |  |  | 4 years |  |  |
Retirement plan, cost recognized |  |  |  |  | $ 4.9 |  |  |
Percent of employee contributions vesting immediately |  |  |  |  | 100.00% |  |  |
Predecessor | Performance Incentive Plan |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |  |
Payments to employees |  |  |  | $ 17.8 |  |  |  |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Payments of cash to employees, including wages and salaries, during the current period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 + Details
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- Definition Incentive plan payout percentages of target values based on performance above a minimum threshold + References No definition available. + Details
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