Restructuring - Expected Cost, Costs Recognized, and Costs to be Recognized - 2016 Projects (Details) - USD ($) $ in Thousands	12 Months Ended			16 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Costs charged to expense	$ 77,183	$ 6,418	$ 49,090
2018 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Total Expected Costs at December 31, 2018	98,713
Costs charged to expense	78,123	0
Expected Remaining Costs to be Recognized at December 31, 2018	20,590
2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Total Expected Costs at December 31, 2018	54,422
Costs charged to expense	(940)			$ 54,212
Expected Remaining Costs to be Recognized at December 31, 2018	1,150
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Costs charged to expense	69,768
Employee Severance [Member] | 2018 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Total Expected Costs at December 31, 2018	73,778
Costs charged to expense	73,778	0
Expected Remaining Costs to be Recognized at December 31, 2018	0
Employee Severance [Member] | 2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Total Expected Costs at December 31, 2018	35,845
Costs charged to expense	(4,010)			39,855
Expected Remaining Costs to be Recognized at December 31, 2018	0
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]
Restructuring Cost and Reserve [Line Items]
Costs charged to expense	859
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, 2018	117
Costs charged to expense	117	0
Expected Remaining Costs to be Recognized at December 31, 2018	0
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] | 2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Total Expected Costs at December 31, 2018	5,664
Costs charged to expense	742			4,922
Expected Remaining Costs to be Recognized at December 31, 2018	0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Costs charged to expense	6,556
Other Restructuring [Member] | 2018 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Total Expected Costs at December 31, 2018	24,818
Costs charged to expense	4,228	$ 0
Expected Remaining Costs to be Recognized at December 31, 2018	20,590
Other Restructuring [Member] | 2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Total Expected Costs at December 31, 2018	12,913
Costs charged to expense	2,328			$ 9,435
Expected Remaining Costs to be Recognized at December 31, 2018	$ 1,150