XML 57 R44.htm IDEA: XBRL DOCUMENT v3.21.2
Employee Benefit Plans - Narrative (Details) - USD ($)
Jan. 01, 2020
Jan. 01, 2019
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]      
Expected contributions to the Company's qualified pension plans in 2021     $ 0
Other Post-retirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Life insurance and contributions to the medical program for eligible retirees will be eliminated (younger than)   65 years  
Life insurance and contributions to the medical program for eligible retirees will be eliminated (older than) 65 years