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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 29, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]        
Contributions by employer   $ 4,000,000.0 $ 3,600,000 $ 3,900,000
Accumulated benefit obligation   374,700,000 390,300,000  
Funding of pension and other postretirement benefit plans   9,044,000 10,004,000 5,678,000
Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Investments in Level 3   0 $ 0  
Qualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year   $ 0    
Accumulated Other Comprehensive Loss [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Decrease in accumulated postretirement benefit obligations       $ 76,700,000
Management Deferred Compensation Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Annual incentive plan, employee permitted minimum defer percentage   50.00%    
Annual incentive plan, employee permitted maximum defer percentage   100.00%    
Management Deferred Compensation Plan [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Basic salary defer percentage   50.00%    
Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Change in monthly retirement benefit amount $ 0      
Non-cash pretax settlement charge 43,000,000.0      
Discount rate used to measure projected benefit obligations for qualified pension plans   3.00% 2.65%  
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year   $ 22,574,000    
Pension Plans [Member] | Qualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Discount rate used to measure projected benefit obligations for qualified pension plans     2.95% 3.40%
Pension Plans [Member] | Qualified Plan [Member] | Funded with Plan Assets [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Transfer of outstanding pension benefit obligation related to qualified pension plans to insurance company $ 101,100,000      
Pension Plans [Member] | Nonqualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year   $ 2,500,000    
Other Postretirement Benefit Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Discount rate used to measure projected benefit obligations for qualified pension plans   2.95% 2.60%  
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year   $ 2,532,000    
Defined Benefit Plan, Assumption Health Care Cost Trend Rate for Next Fiscal Year   4.00%    
Other Postretirement Benefit Plans [Member] | Nonqualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year   $ 2,500,000    
Other Postretirement Benefit Plans [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Health care cost trend rate assumed for next fiscal year   6.06%    
Other Postretirement Benefit Plans [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Health care cost trend rate assumed for next fiscal year   6.58%