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- Additional Information (Details)
 7 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
option
facility
$ / Hour
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Multiemployer Defined Benefit Plans Contribution Rate | $ / Hour   4.00    
Defined Benefit Plan, Number of Investment Options Holding Substantially All Pension Funds | option   8    
Employer contributions   $ 17,300,000 $ 15,300,000 $ 14,700,000
Number of our manufacturing facilities participating in multiemployer defined benefit pension plans | facility   1    
Multiemployer Plans, Withdrawal Obligation   $ 82,000,000    
Contribution rates | $ / Hour   4.00    
Additional contribution, percent of contractual contribution rate 2.50%      
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   7.70%    
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 0.035    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   4.20%    
Other Deferred Compensation Arrangements, Liability, Current and Noncurrent $ 2,500,000 $ 3,200,000 2,500,000  
USW        
Defined Benefit Plan Disclosure [Line Items]        
Multiemployer Defined Benefit Plans Contribution Rate | $ / Hour   2.79    
Contribution rates | $ / Hour   2.79    
Maximum | Domestic equities        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
Maximum | International Equities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   10.00%    
Maximum | Corporate bonds        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   90.00%    
Maximum | Liquid reserves        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
Maximum | Plan A [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Funded Percentage Of Pension Protection Plan   65.00%    
Maximum | Plan B [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Funded Percentage Of Pension Protection Plan   80.00%    
Minimum | Domestic equities        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
Minimum | International Equities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   5.00%    
Minimum | Corporate bonds        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   80.00%    
Minimum | Liquid reserves        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   0.00%    
Minimum | Plan B [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Funded Percentage Of Pension Protection Plan   65.00%    
Minimum | Plan C [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Funded Percentage Of Pension Protection Plan   80.00%    
Pension Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 306,600,000 $ 335,900,000 306,600,000 268,800,000
Employer contribution   $ 500,000 500,000  
Other Postretirement Employee Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
defined benefit plan, ultimate health care cost trend rates, with added benefits   4.50%    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year   6.90%    
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate   6.00%    
Assumed health care cost trend rates used to determine the company's benefit obligations and expense   6.90%    
Assumed health care cost trend rates, graded rate   6.00%    
Expected year when trend rate to be reached   60 years    
Fair value of plan assets 0 $ 0 0 0
Employer contribution   $ 5,600,000 7,000,000.0  
Other Postretirement Employee Benefit Plans | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
defined benefit plan, ultimate health care cost trend rates, with added benefits   3.70%    
Assumed health care cost trend rate, graded   3.70%    
Supplemental Employee Retirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer contribution   $ 500,000    
Defined Benefit Plan, Accumulated Benefit Obligation $ 2,200,000 2,400,000 2,200,000  
Cost of Sales [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax   1,900,000 1,500,000  
Selling, General and Administrative Expenses [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax   $ 500,000 $ 1,000,000.0 800,000
Non-operating expense [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax       $ 1,200,000