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Postretirement Benefit Plans (Details) | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2018 USD ($) | Nov. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) employees | May 31, 2020 USD ($) | Dec. 31, 2019 USD ($) employees | May 31, 2019 USD ($) | Dec. 31, 2018 USD ($) employees
Multiemployer Defined Contributory Trust Plan [Member] |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |
Number of employees in plan | employees |  |  | 735 |  | 1,215 |  | 1,221
Required employer's contribution per hour per active employee |  |  | $ 0.90 |  | $ 0.90 |  | $ 0.85
Required defined contributory trust contribution, percent of earnings. |  |  | 4.50% |  | 4.50% |  | 4.50%
Period Contributions |  |  | $ 2,400,000 |  | $ 2,600,000 |  | $ 2,800,000
Multiemployer Health and Welfare Plan [Member] |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |
Number of employees in plan | employees |  |  |  |  | 475 |  | 604
Required employer's contribution per hour per active employee | $ 6.10 | $ 7.00 |  | $ 6.70 |  | $ 6.40 |
Period Contributions |  |  | $ 5,800,000 |  | $ 6,700,000 |  | $ 7,700,000

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- Definition Represents the required employer's contribution per hour per active employee. + References No definition available. + Details
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- Definition Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29639808&loc=d3e29008-114946 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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- Definition Percentage of employer contribution required by collective-bargaining arrangement (CBA) to total contribution from all participating employers in multiemployer pension plan determined to be individually insignificant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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