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Retirement Plans - Narrative (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 Contribution Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation liability, current and noncurrent |  | $ 2,300,000 |  | $ 2,544,000 | $ 2,275,000
Foreign Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  |  | $ 8,070,000 | 7,613,000
Qualified Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Employer discretionary contribution, percent of qualified cash compensation (up to) |  | 5.00% |  | 5.00% |
Qualified Plan | United States |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | $ 2,600,000 | $ 2,423,000 | $ 3,311,000 | $ 3,337,000
Qualified Plan | Foreign Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | 5,566,000 | 5,956,000 |  |
Nonqualified Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Contributions by employer |  | $ 0 | $ 0 |  |
Dividends, common stock, paid-in-kind | $ 41,948,000 |  |  |  |
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 Contribution Plan Disclosure [Line Items] |  |  |  |  |
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 Contribution Plan Disclosure [Line Items] |  |  |  |  |
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 Contribution Plan Disclosure [Line Items] |  |  |  |  |
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 Contribution Plan Disclosure [Line Items] |  |  |  |  |
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 Contribution Plan Disclosure [Line Items] |  |  |  |  |
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 Contribution Plan Disclosure [Line Items] |  |  |  |  |
Vesting percentage |  | 20.00% |  | 20.00% |

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