XML 56 R41.htm IDEA: XBRL DOCUMENT v3.20.4
Employee Benefits - Additional Information (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
employee
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Number of employees sponsored by defined benefit pension plans | employee   9,000    
Settlement adjustment   $ 3,600,000 $ 1,800,000 $ 10,900,000
Pension expense   6,500,000    
Pension expense recognition of settlements from lump sum payouts   3,600,000    
Cash contributions   $ 36,500,000 $ 9,700,000  
Current plan assumptions for discount rate   3.56% 4.44% 3.77%
Return on assets   7.00% 7.00% 7.00%
Overfunded (underfunded) status of plans   $ 48,400,000 $ (228,800,000)  
Plan assets expected to be returned   0    
Unrecognized actuarial losses before tax   162,100,000 396,300,000  
Unrecognized actuarial losses net of tax   152,500,000    
Expected contributions for pension plans in next fiscal year   4,700,000    
Expected significant annual contributions for pension plans thereafter   0    
Income tax expense (benefit) related to amounts in other comprehensive income   14,600,000 (300,000) $ (100,000)
Pension plan, net losses   171,500,000    
Projected benefit obligation   $ 1,142,300,000    
Average remaining life expectancy of plan participants   19 years    
Amortization of plan assets   $ 14,300,000 12,800,000  
Employer discretionary contribution amount   3,700,000 12,800,000 13,300,000
Annual Incentive Plan        
Defined Benefit Plan Disclosure [Line Items]        
Incentive accruals   10,000,000.0 0 29,800,000
Pension        
Defined Benefit Plan Disclosure [Line Items]        
Contribution to the multi-employer plan   $ 115,000,000.0 $ 128,800,000 $ 112,600,000
Increase in annual future employer contribution   3.50%    
Workforce Subject to Collective Bargaining Arrangements | Labor Force Concentration Risk        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of labor force   79.00%    
Forecast        
Defined Benefit Plan Disclosure [Line Items]        
Current plan assumptions for discount rate 2.81%      
Return on assets 5.00%      
Expected income $ 5,600,000      
Future expected rate of return on assets 5.00%      
Net loss on expected amortization of plan assets $ 12,300,000      
Minimum | Pension        
Defined Benefit Plan Disclosure [Line Items]        
Minimum contribution percentage     5.00% 5.00%
Multiemployer plan, additional surcharge required contribution rate   5.00%    
Maximum | Pension        
Defined Benefit Plan Disclosure [Line Items]        
Multiemployer plan, additional surcharge required contribution rate   10.00%