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Restructuring - Expected Cost, Costs Recognized, and Costs to be Recognized (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 17, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Costs charged to expense |  | $ 37,013 | $ 6,278 | $ 77,183
2020 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Expected Costs at December 31, 2020 |  | 59,677 |  |
Costs charged to expense | $ 43,200 | 43,232 | 0 |
Expected Remaining Costs to be Recognized at December 31, 2020 |  | 16,445 |  |
2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Expected Costs at December 31, 2020 |  | 85,821 |  |
Costs charged to expense |  | (6,219) | 87,395 |
Expected Remaining Costs to be Recognized at December 31, 2020 |  | 4,645 |  |
Employee Severance [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Costs charged to expense |  | 27,265 |  |
Employee Severance [Member] | 2020 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Expected Costs at December 31, 2020 |  | 36,225 |  |
Costs charged to expense |  | 36,225 | 0 |
Expected Remaining Costs to be Recognized at December 31, 2020 |  | 0 |  |
Employee Severance [Member] | 2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Expected Costs at December 31, 2020 |  | 63,173 |  |
Costs charged to expense |  | (8,960) | 72,133 |
Expected Remaining Costs to be Recognized at December 31, 2020 |  | 0 |  |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Costs charged to expense |  | 5,888 |  |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] | 2020 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Expected Costs at December 31, 2020 |  | 6,944 |  |
Costs charged to expense |  | 6,944 | 0 |
Expected Remaining Costs to be Recognized at December 31, 2020 |  | 0 |  |
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] | 2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Expected Costs at December 31, 2020 |  | 2,786 |  |
Costs charged to expense |  | (1,056) | 3,842 |
Expected Remaining Costs to be Recognized at December 31, 2020 |  | 0 |  |
Other Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Costs charged to expense |  | 3,860 |  |
Other Restructuring [Member] | 2020 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Expected Costs at December 31, 2020 |  | 16,508 |  |
Costs charged to expense |  | 63 | 0 |
Expected Remaining Costs to be Recognized at December 31, 2020 |  | 16,445 |  |
Other Restructuring [Member] | 2018 Projects [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Expected Costs at December 31, 2020 |  | 19,862 |  |
Costs charged to expense |  | 3,797 | $ 11,420 |
Expected Remaining Costs to be Recognized at December 31, 2020 |  | $ 4,645 |  |

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