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Retirement Plans - 401(k) Plan (Details) - USD ($)
9 Months Ended 12 Months Ended
Aug. 28, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits          
Defined Benefit Plan Disclosure          
Deferred compensation liability, current and noncurrent   $ 2,300,000   $ 2,544,000 $ 2,275,000
Qualified Plan          
Defined Benefit Plan Disclosure          
Employer discretionary contribution, percent of qualified cash compensation (up to)   5.00%   5.00%  
Nonqualified Plan          
Defined Benefit Plan Disclosure          
Contributions by employer   $ 0 $ 0    
Dividends, common stock, paid-in-kind $ 41,948,000        
Nonqualified Plan | Deferred Compensation, Share-based Payments [Member]          
Defined Benefit Plan Disclosure          
Contributions by employer       $ 0 0
United States | Qualified Plan          
Defined Benefit Plan Disclosure          
Employer contributions   2,600,000 2,423,000 3,311,000 3,337,000
Foreign Plan          
Defined Benefit Plan Disclosure          
Employer contributions       $ 8,070,000 $ 7,613,000
Foreign Plan | Qualified Plan          
Defined Benefit Plan Disclosure          
Employer contributions   $ 5,566,000 $ 5,956,000    
Share-based Payment Arrangement, Tranche One | Nonqualified Plan | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | Prior to January 2016 Awards [Member]          
Defined Benefit Plan Disclosure          
Vesting percentage   20.00%   20.00%  
Share-based Payment Arrangement, Tranche One | Nonqualified Plan | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | After January 2016 Awards [Member]          
Defined Benefit Plan Disclosure          
Vesting percentage   100.00%   100.00%  
Share-based Payment Arrangement, Tranche Two | Nonqualified Plan | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | Prior to January 2016 Awards [Member]          
Defined Benefit Plan Disclosure          
Vesting percentage   20.00%      
Share-based Payment Arrangement, Tranche Three | Nonqualified Plan | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | Prior to January 2016 Awards [Member]          
Defined Benefit Plan Disclosure          
Vesting percentage   20.00%   20.00%  
Share-Based Payment Arrangement, Tranche Four | Nonqualified Plan | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | Prior to January 2016 Awards [Member]          
Defined Benefit Plan Disclosure          
Vesting percentage   20.00%      
Share-Based Payment Arrangement, Tranche Four | Nonqualified Plan | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | Deferred Compensation, Share-based Payments [Member] | Prior to January 2016 Awards [Member]          
Defined Benefit Plan Disclosure          
Vesting percentage       20.00%  
Share-Based Payment Arrangement, Tranche Five | Nonqualified Plan | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits | Prior to January 2016 Awards [Member]          
Defined Benefit Plan Disclosure          
Vesting percentage   20.00%   20.00%