Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plans - Assumptions (Details)

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Employee Retirement Plans - Assumptions (Details) - Other postretirement benefit cost
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assumptions used in determining net periodic pension cost for the plans      
Discount rates (as a percent) 2.10% 3.00% 4.00%
Summary of healthcare cost trend rates      
Ultimate healthcare cost trend rate (as a percent) 4.50% 4.50% 4.50%
Participation (as a percent) 60.00% 60.00% 60.00%
Assumed health care cost trend rate for the next fiscal year (as a percent) 7.00% 7.00% 6.80%
Ultimate rate in 2030 (as a percent) 4.50%    
Ultimate rate in 2029 (as a percent)   4.50%  
Ultimate rate in 2028 (as a percent)     4.50%
Assumptions used to determine the benefit obligation      
Discount rate (as a percent) 2.50% 2.10%